Recursive finding of django templates

Accept multiple arguments instead of just one. If an argument is a
directory, recursively find all html and txt files within.
Merge pull request #3 from izidormatusov/master

Recursive finding of django templates
Merge pull request #1 from carschar/master

Formalize as a package
Added GPLv3 licence
added copyright notice
Dual licencing this under GPLv3 and BSD
add exclude flag and some additional regexes to exclude strings that shouldn't be translated
fix the regex and add option to overwrite old files
Merge pull request #6 from pegler/master

Exclude flag and more regexes
make work if there are no excluded files listed
rearrange
split into main method
refactor to make more function
unittests
refactor and genericise unittests
more tests
more tests
add travis
some code formatting
pep8 fixes