Update connection string parsing
Update init for mysql database
Fix sqlite path creation
Add mysql-python to pip requirements
Add mysql tests. Mark and exclude them from default tests
Update connection string regexp
Update mysqltest and add rule to Makefile
Parametrize tests for sqlite and mysql dbs
Fix update methods for mysql
Add return status to execute and cascade delete to Job relationships
Remove cascade delete since it enforces single parents on many to many relationships
Update mysqltest in Makefile
Parametrize db tests for mysql and sqlite
Add conftest.py
Fix db test and finalize MySQL implementation. Resolves #53