Update CMake README (#23)

* Update CMake README

THe readme file for cmake discusses subversion.  I made the changes I think are needed for git.

* Remove the svn "r"

makes no sense to have a prepended r to the git hash string

README.CMake

@@ -30,10 +30,10 @@ Information for building GMT with CMake
 Quick start:
 ~~~~~~~~~~~~
 
-Checkout GMT5 from its subversion repository:
+Checkout GMT5 from its GitHub repository:
 
- $ svn co svn:https://gmtserver.soest.hawaii.edu/gmt/trunk gmt-dev
- $ cd gmt-dev
+ $ git clone https:https://github.com/GenericMappingTools/gmt
+ $ cd gmt
  $ cp cmake/ConfigUserTemplate.cmake cmake/ConfigUser.cmake
 
 Edit *cmake/ConfigUser.cmake* [see comments in the file]. Then:
@@ -70,8 +70,8 @@ There are two configuration files:
 
 1. "ConfigDefault.cmake" -- is version controlled and used to add new default
  variables and set defaults for everyone. You should not edit this file.
-2. "ConfigUser.cmake" -- is not version controlled (currently listed in
- svn:ignore property) and used to override defaults on a per-user basis.
+2. "ConfigUser.cmake" -- is not version controlled and used to override defaults
+ on a per-user basis.
  There is a template file, ConfigUserTemplate.cmake, that you should copy
  to ConfigUser.cmake and make your changes therein.
 
@@ -149,7 +149,7 @@ Assuming you did not delete the build directory and that your current
 working directory is the build directory this is just as simple as
 
  $ cd ..
- $ svn up
+ $ git pull
  $ cd -
  $ make -jx install
 
@@ -179,7 +179,7 @@ Set GMT_RELEASE_PREFIX in cmake/ConfigUser.cmake and run cmake. Then do
 You should then edit ${GMT_RELEASE_PREFIX}/cmake/ConfigDefault.cmake and
 set GMT_PACKAGE_VERSION_MAJOR, GMT_PACKAGE_VERSION_MINOR, and
 GMT_PACKAGE_VERSION_PATCH. Also uncomment and set
-GMT_SOURCE_CODE_CONTROL_VERSION_STRING to the current svn version. Then
+GMT_SOURCE_CODE_CONTROL_VERSION_STRING to the current git version. Then
 create tarballs with:
 
  $ make -jx gmt_release_tar

src/gmt_version.h.in

@@ -31,7 +31,7 @@
 
 #cmakedefine GMT_SOURCE_CODE_CONTROL_VERSION_STRING "@GMT_SOURCE_CODE_CONTROL_VERSION_STRING@"
 #ifdef GMT_SOURCE_CODE_CONTROL_VERSION_STRING
-# define GMT_STRING "@GMT_PACKAGE_VERSION_WITH_SVN_REVISION@ (r@GMT_SOURCE_CODE_CONTROL_VERSION_STRING@)"
+# define GMT_STRING "@GMT_PACKAGE_VERSION_WITH_SVN_REVISION@ (@GMT_SOURCE_CODE_CONTROL_VERSION_STRING@)"
 #else /* if HAVE_SVN_VERSION or if unversioned */
 # define GMT_STRING "@GMT_PACKAGE_VERSION_WITH_SVN_REVISION@"
 #endif