Added version folders for configuration files.  NewRelic does not have configuration files, but this keeps the folder structure consistent and prevents errors with the binaries script.
Renamed config file to be compatible with other config names (i.e. main dir ends in 'x', other dirs link to it).
Fixed bug with --latest.  It now accepts 'yes', 'true', 't' or '1' (case insensitive) to enable the flag or anything else ('no', 'off', 'false', 'f', '0') to disable it.
Added documentation for  command and for creating a custom binary repo.
Fixed binaries link.
Added more info about binaries script.  Fixed a couple minor issues.
Fixed a couple doc issues.
Upgraded to PHP 5.5.11.
Upgraded to PHP 5.5.27.
Fixed mistake with version number of config directory.
Updated list of included extensions.
Added PHP 5.5.11 & 5.4.27.  Removed some older versions (only maintaining the three most recent binaries) and the -dev releases (these were a limited time test).
Merge remote-tracking branch 'upstream/master'