php-cs-fixer

Don't iterate over positions that have already been unset

Fixes matthiasmullie#245

Run tests with Docker

Add test for matthiasmullie#227

Add 7.2 to build matrix

Leave calc expressions alone when stripping units off of 0

Fixed matthiasmullie#217

Fix PHP5.3 compatibility

Yet another ugly workaround...
Fixes matthiasmullie#208

Regexes can also start in array

Fixes matthiasmullie#209

Use docker-compose for faster volume switching

Don't confuse comments with regex

Fixed matthiasmullie#199