Switch to tox develeopment mode to fix source view on coveralls.

tox.ini

@@ -9,6 +9,8 @@ python =
   3.6: py36-driver-{hsqldb,mock,sqliteXerial}
 
 [testenv]
+# usedevelop required to enable coveralls source code view.
+usedevelop=True
 whitelist_externals = mvn
 passenv = TRAVIS TRAVIS_JOB_ID TRAVIS_BRANCH
 setenv =
@@ -21,7 +23,6 @@ deps =
   py26: unittest2==0.5.1
   # urllib3 required by coveralls. See https://github.com/eddyxu/cpp-coveralls/issues/108
   py26: urllib3[secure]
-
   py: JPype1==0.6.2
   jip==0.9.10
   coveralls
@@ -32,6 +33,6 @@ commands =
   driver-sqliteXerial:  jip install org.xerial:sqlite-jdbc:3.7.2
   driver-mock: mvn -Dmaven.repo.local={toxworkdir}/shared/.m2/repository -f mockdriver/pom.xml install
   driver-mock: jip install org.jaydebeapi:mockdriver:1.0-SNAPSHOT
-  coverage run -a --source {envsitepackagesdir}/jaydebeapi test/testsuite.py {env:TESTNAME}
-  driver-hsqldb: coverage run -a --source {envsitepackagesdir}/jaydebeapi test/doctests.py
+  coverage run -a --source jaydebeapi test/testsuite.py {env:TESTNAME}
+  driver-hsqldb: coverage run -a --source jaydebeapi test/doctests.py
   python ci/run_coveralls.py