enable caching for pull requests
Bumping ruby version, only setting constraint on heroku

plus bumping travis-support dependency.
Provide built-in Godep support
Adjust the gopath bin to use a fully defined path
Merge pull request #309 from zackkitzmiller/master

Provide built-in Godep support
Minor touchup post-merge of #309
Only install Godeps/Godep requirements in go_version >= 1.1
Merge pull request #310 from zackkitzmiller/master

Only install Godeps/Godep requirements in go_version >= 1.1
Set TRAVIS_SECURE_ENV_VARS to 'true' when secure var is set on Settings tab

Fixes https://github.com/travis-ci/travis-ci/issues/2820
Godep integration behavior updates per feedback from @kr on #309
Merge pull request #305 from travis-ci/rkh-cache-prs

enable caching for pull requests
Change firefox download location

releases.mozilla.org is CDN'd, while ftp.mozilla.org is not.
This should result in much faster downloads when the pre-installed
firefox is not sufficient.
Change firefox download location

releases.mozilla.org is CDN'd, while ftp.mozilla.org is not.
This should result in much faster downloads when the pre-installed
firefox is not sufficient.
Fix spec to match the previous commit
Merge pull request #312 from travis-ci/db-godep-tweaks

Godep integration behavior updates per feedback from @kr on #309
Exporting NVM_NODEJS_ORG_MIRROR to work around nodejs.org switch to https
Merge pull request #313 from travis-ci/db-bugfix-nvm-workaround

Exporting NVM_NODEJS_ORG_MIRROR to work around nodejs.org switch to https
Re-sourcing nvm.sh
Getting more heavy handed with nvm
Merge pull request #314 from travis-ci/db-bugfix-nvm-workaround

[WIP] More nvm workarounding