travis: try yet another yarn installation method

.gitignore

@@ -30,7 +30,6 @@ local/
 ui/*/npm-debug.log
 .vagrant
 hs_*.log
-yarn.lock
 
 RUNNING_PID
 

.travis.yml

@@ -68,7 +68,7 @@ jobs:
  packages:
  - parallel
  before_install:
- - curl -o- -L https://yarnpkg.com/install.sh | bash
+ - yarn --version
  - yarn global add gulp-cli
  script: ./ui/build prod
  after_success:

yarn.lock

@@ -0,0 +1,123 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+ansi-regex@^2.0.0:
+ version "2.1.1"
+ resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
+
+ansi-styles@^2.2.1:
+ version "2.2.1"
+ resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
+
+argparse@^1.0.7:
+ version "1.0.9"
+ resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.9.tgz#73d83bc263f86e97f8cc4f6bae1b0e90a7d22c86"
+ dependencies:
+ sprintf-js "~1.0.2"
+
+chalk@^1.1.3:
+ version "1.1.3"
+ resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
+ dependencies:
+ ansi-styles "^2.2.1"
+ escape-string-regexp "^1.0.2"
+ has-ansi "^2.0.0"
+ strip-ansi "^3.0.0"
+ supports-color "^2.0.0"
+
+clap@^1.0.9:
+ version "1.2.0"
+ resolved "https://registry.yarnpkg.com/clap/-/clap-1.2.0.tgz#59c90fe3e137104746ff19469a27a634ff68c857"
+ dependencies:
+ chalk "^1.1.3"
+
+coa@~1.0.1:
+ version "1.0.3"
+ resolved "https://registry.yarnpkg.com/coa/-/coa-1.0.3.tgz#1b54a5e1dcf77c990455d4deea98c564416dc893"
+ dependencies:
+ q "^1.1.2"
+
+colors@~1.1.2:
+ version "1.1.2"
+ resolved "https://registry.yarnpkg.com/colors/-/colors-1.1.2.tgz#168a4701756b6a7f51a12ce0c97bfa28c084ed63"
+
+csso@~2.3.1:
+ version "2.3.2"
+ resolved "https://registry.yarnpkg.com/csso/-/csso-2.3.2.tgz#ddd52c587033f49e94b71fc55569f252e8ff5f85"
+ dependencies:
+ clap "^1.0.9"
+ source-map "^0.5.3"
+
+escape-string-regexp@^1.0.2:
+ version "1.0.5"
+ resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
+
+esprima@^2.6.0:
+ version "2.7.3"
+ resolved "https://registry.yarnpkg.com/esprima/-/esprima-2.7.3.tgz#96e3b70d5779f6ad49cd032673d1c312767ba581"
+
+has-ansi@^2.0.0:
+ version "2.0.0"
+ resolved "https://registry.yarnpkg.com/has-ansi/-/has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"
+ dependencies:
+ ansi-regex "^2.0.0"
+
+js-yaml@~3.7.0:
+ version "3.7.0"
+ resolved "https://registry.yarnpkg.com/js-yaml/-/js-yaml-3.7.0.tgz#5c967ddd837a9bfdca5f2de84253abe8a1c03b80"
+ dependencies:
+ argparse "^1.0.7"
+ esprima "^2.6.0"
+
+[email protected]:
+ version "0.0.8"
+ resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
+
+mkdirp@~0.5.1:
+ version "0.5.1"
+ resolved "https://registry.yarnpkg.com/mkdirp/-/mkdirp-0.5.1.tgz#30057438eac6cf7f8c4767f38648d6697d75c903"
+ dependencies:
+ minimist "0.0.8"
+
+q@^1.1.2:
+ version "1.5.0"
+ resolved "https://registry.yarnpkg.com/q/-/q-1.5.0.tgz#dd01bac9d06d30e6f219aecb8253ee9ebdc308f1"
+
+sax@~1.2.1:
+ version "1.2.4"
+ resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
+
+source-map@^0.5.3:
+ version "0.5.6"
+ resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.6.tgz#75ce38f52bf0733c5a7f0c118d81334a2bb5f412"
+
+sprintf-js@~1.0.2:
+ version "1.0.3"
+ resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
+
+strip-ansi@^3.0.0:
+ version "3.0.1"
+ resolved "https://registry.yarnpkg.com/strip-ansi/-/strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
+ dependencies:
+ ansi-regex "^2.0.0"
+
+supports-color@^2.0.0:
+ version "2.0.0"
+ resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
+
+svgo@^0.7:
+ version "0.7.2"
+ resolved "https://registry.yarnpkg.com/svgo/-/svgo-0.7.2.tgz#9f5772413952135c6fefbf40afe6a4faa88b4bb5"
+ dependencies:
+ coa "~1.0.1"
+ colors "~1.1.2"
+ csso "~2.3.1"
+ js-yaml "~3.7.0"
+ mkdirp "~0.5.1"
+ sax "~1.2.1"
+ whet.extend "~0.9.9"
+
+whet.extend@~0.9.9:
+ version "0.9.9"
+ resolved "https://registry.yarnpkg.com/whet.extend/-/whet.extend-0.9.9.tgz#f877d5bf648c97e5aa542fadc16d6a259b9c11a1"