pytest autodiscovery no longer borks on test_requirements.txt
Tests for empty string translation
Test fix
Implementation for empty string translation
Addressing code review
is_translatable -> is_translatable_value
Using positive conditionals
Optimization
Merge pull request #14 from onefinestay/translate-empty-string-sql

Translate empty string sql
Merge branch 'master' into translate-empty-string-kaiso

Conflicts:
	taal/kaiso/__init__.py
	taal/sqlalchemy/types.py