Merge pull request #43 from kohana/bug/3.3/build-fixes

Fix travis build and test execution
Track bugfixes in kohana/core
Remove redundant phpenv rehash from travis build

This is only required if using PEAR packages, and should
have been removed in ec9c1b2
Temporarily run tests without phing on HHVM

Phing doesn't yet support HHVM, so run tests directly
in this environment. This can be reverted in future
once we can run phing (hhvm support is planned for
2.9.0).