Fix tail -f issue #347
update phar file
Checking in changes prior to tagging of version 1.15.1.
Changing use, switch, remove behaviour.

Summary:

    from:

        phpbrew use|switch|remove [version]

    to:

        phpbrew use|switch|remove [build name]

Reason:

Since users might have different build with the same version, users need
to explicitly specify the "build name" instead of just the version name.

Affect:

phpbrew use 5.3 won't work, please use phpbrew use php-5.3.3 instead.

Note:

Smart version name guessing can be done later and should depend on the
locally installed versions, should not use the previously used
findLatestMinorVersion() method to detect the installed php.
update successful build message
Fix issue #351 for php that doesn't support curl
Note the default variants
Add more details to the exception message
Checking in changes prior to tagging of version 1.15.2.
Merge branch 'master' into develop