Reenable opcache with PHP 5.5
Add a comment explaining opcache.interned_strings_buffer
Remove the opcache for CLI setting, as we will not be using it
Add a comment on opcache.memory_consumption
Enable an error log for opcache, explicitly set verbosity to 1

We may turn this off in the future, but we should be aware of any
errors while starting off with opcache.
Remove mostly irrelevant default settings from opcache.ini
Merge pull request #77 from washingtonstateuniversity/opcache

[PR] Reenable opcache with PHP 5.5, modify some defaults