Merge pull request #14 from bosqueviejo/master

gettext rebarified
CallbackMod never called

Due changes in commit 9c3122c9aba0e9908b437f3cee9856d14ea59778 setting
default return values for gettext_compile:get_env/1 the callback is
never called. It expects the function returns undefined.

Changed undefined to default values.
Merge pull request #16 from ncgmoviles/callbackmod_never_called

CallbackMod never called
add clause to pt for parameterized modules
Add comment
Replace unimportant utf-8 with iso-latin-1 characters
Remove trailing whitespace
create epot file name the proper way
Merge branch 'master' of https://github.com/etnt/gettext into etnt