Add lines_group and string_group methods
Rename object to lines
Add Match class with match method
Add multiline matching
Match returns match_found variable

To easily filter wheter or not a match was found.
Fail on missing search pattern
Add Color class and make the tool work for a given file
Use find to get all files
Add binary file filter
Add no-filename and files-with-matches options
Add line numbers
Add Copyright
Fix color to right outputs