Added tox configuration

tox.ini

@@ -0,0 +1,23 @@
+[tox]
+envlist = cleanup,py27,pep8
+
+usedevelop = True
+
+[testenv]
+usedevelop=True
+setenv = COVERAGE_FILE = .coverage
+commands = py.test --cov=pygtktalog --cov-report=term-missing
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+
+[testenv:pep8]
+usedevelop=True
+commands = py.test --pep8 -m pep8
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+
+[testenv:cleanup]
+setenv =
+COVERAGE_FILE = .coverage
+deps = coverage
+commands = coverage erase