Install alex and happy, get rid of symlinking
add ghc_finder
fix version choosing in ghc_finder
error if ghc_find cannot find a version
Echo error to >&2
Merge pull request #244 from dmalikov/master

multi-ghc approach without ghc-select script and symlinking
ghc_find in separate executable
Merge pull request #246 from dmalikov/master

ghc_find in separate executable
Update changelog.
Update changes.md
Configurable hhvm package name.
Support for a pre-release of HHVM 2.3.0.
Fix HHVM version and package URL.
add encodings to metadata files that use non-ascii chars
Merge pull request #247 from travis-ci/sf-fix-encoding

add encodings to metadata files that use non-ascii chars
HHVM 2.3.0 has been officialy released!
Use a symlink instead of a shim for HHVM to fix PHP's command line emulation.

Fixes travis-ci/travis-ci#1746.
Support for PHP 5.4.23 and 5.5.7.