Fixed boolean comparison to properly handle empty strings. The comparison
on line 20 now follows the style of the comparison on line 31.
Add prose about purge_configs

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

Also minor spelling fixes.
Remove vhost symlink if ensure != present.
Merge pull request #402 from nibalizer/patch-1

Add prose about purge_configs
Merge pull request #392 from glbsd/master

Fix for https://github.com/puppetlabs/puppetlabs-apache/issues/248
Merge pull request #380 from pataquets/remove-vhost-symlink-if-ensure-absent

Remove vhost symlink if ensure != present.
Apache does not allow space in value for Order directive
Merge pull request #409 from UCB-RAC/master

update docs: Apache does not allow space in value for Order directive