Merge pull request #45 from Unister/master

phpunit as development dependency
Modified target file names to include last-modified timestamp in them.
Merge pull request #47 from zygous/master

Modify target file names to include last-modified timestamp in them
move lessphp to suggest in composer
Modified code that inserts a last modified timestamp into asset file names so that only CSS and JS assets are affected, and so that the timestamp is only inserted into the file name once, just before the file extension.
Merge pull request #53 from zygous/master

Fix issue #52
Allow the configuration of "acceptable errors"

Assets are not included if the dispatch error is not in whitelist of
allowed errors.
The BjyAuthorize module throws a \BjyAuthorize\Guard\Route::ERROR
error, which should still include assets
Merge pull request #54 from rhysr/acceptable_errors

Allow the configuration of "acceptable errors"
added acceptable errors docs
Merge pull request #55 from rhysr/acceptable_errors

added acceptable errors docs
Update README.md
Ensure we check the result of `strpos()` correctly
Merge pull request #58 from dshafik/strpos-returns-boolean

Ensure we check the result of `strpos()` correctly
update tests
Fixing problem with mixin check
Merge pull request #59 from evelop/master

Mixin config does not work as intended
configuration param to override the umask
Merge pull request #60 from tommyseus/master

Option to set the umask