Updated filehandling version dependency

Merge pull request #54 from austenc/L7-fixes

L7 fixes

Updated php versions for travis

Updated changelog

Added reference to changes for 2.7.4

Configuration option: fire events rather than throw exceptions proces…

…sing (default now)

Added option to only refresh specific variants with console command

Added option to only refresh specific variants with console command

Processing variants now cleans up temporary files afterwards

Processing variants now cleans up temporary files afterwards