Don't add superfluous port part.

In case of HTTPS requests, don't add :port to URI if it goes to the
default port, 443.

Only set connection header if it's not present.

Add websocket test.

Update .gitignore.

Don't use CONNECT via parent proxy for HTTPS.

Use Go 1.3 on Travis CI.

Fix read timeout handling.

Comment cosmetics.

Merge pull request #1 from ldx/connectpr

Handle non-SSL/TLS CONNECT requests.

Don't build release tags.