Setup for Coverage and Codcov.io (#6)

* coverage

* coveragerc

* fix placeholder

.coveragerc

@@ -0,0 +1,13 @@
+[run]
+branch = True
+source = dbfilestorage
+
+[report]
+exclude_lines =
+    if self.debug:
+    pragma: no cover
+    raise NotImplementedError
+    if __name__ == .__main__.:
+ignore_errors = True
+omit =
+    tests/*

requirements.txt

@@ -1,2 +1,3 @@
 Django==1.10.4
 Sphinx==1.5
+coverage==4.2

setup.cfg

@@ -0,0 +1,9 @@
+[nosetests]
+verbosity=1
+detailed-errors=1
+with-coverage=1
+cover-package=dbfilestorage
+debug=nose.loader
+pdb=1
+pdb-failures=1
+