Update .travis.yml

[GrahamCampbell]

There's no point in testing on php 5.6 and hhvm when it clearly doesn't work. Also, I've fixed the composer install issues where it was downloading everything twice because dist install was failing.

[mtdowling]

I don't want to remove them from the tests. It's there so that the issues with those versions are known and can be fixed.

Also, I've fixed the composer install issues where it was downloading everything twice because dist install was failing.

Can you update the PR to just be this change?

[GrahamCampbell]

What I was meaning is we that we don't even get to the point of running the test suite on those versions, so why waste travis resources? Surely it would be a better idea to only enable those versions once that's actually been fixes?

[mtdowling]

Instead of removing them, I'd like to just keep this issue open to track it.

1. Testing pecl-http on 5.6 fails. We could just remove the pecl tests from Travis. It's only needed for testing a single fringe class that is probably not utilized by anyone.
2. Calling pear on HHVM: The command "pear config-set php_ini ~/.phpenv/versions/php -r 'echo phpversion();'/etc/php.ini" failed and exited with 127 during .. This is also due to having to test pecl-http I believe.

[mtdowling]

HHVM and 5.6 are now fixed.