Add prose about purge_configs

For some reason purge_configs wasn't in the text of the README.

Also minor spelling fixes.
Fixed boolean comparison to properly handle empty strings. The comparison
on line 20 now follows the style of the comparison on line 31.
Remove vhost symlink if ensure != present.
Apache does not allow space in value for Order directive
Correct incorrect expects and init race condition
Add prose about purge_configs

For some reason purge_configs wasn't in the text of the README.

Also minor spelling fixes.
Fixed boolean comparison to properly handle empty strings. The comparison
on line 20 now follows the style of the comparison on line 31.
Remove vhost symlink if ensure != present.
Apache does not allow space in value for Order directive
Added redirectmatch support
Merge branch 'master' of github.com:pablokbs/puppetlabs-apache