modified initial config for travis-ci

The following has been removed:

- HTML report, as it is not used at all and may require to define more
  environment

The following has been added:

- py27, py33, py34 specific coverage reports

NOTES:

- It is possible to use environment generators (http://tox.readthedocs.org/en/latest/config.html#generating-environments-conditional-settings)
  but this will make the implicit mode run more modes by default.
- As referenced at https://bitbucket.org/hpk42/tox/issue/120/substitution-breaks-for-commands,
  substitution for commands does not work yet. If substitution for commands is
  implemented someday, the tox.ini file would be simpler.

.travis.yml

@@ -5,10 +5,9 @@
 language: python
 
 env:
-  - TOX_ENV=py27
-  - TOX_ENV=py33
-  - TOX_ENV=py34
-  - TOX_ENV=coverage
+  - TOX_ENV=py27,py27-coverage
+  - TOX_ENV=py33,py33-coverage
+  - TOX_ENV=py34,py34-coverage
   - TOX_ENV=pep8
 
 before_install:
@@ -63,4 +62,5 @@ install:
   - pip install tox
 
 script:
+  - tox --version
   - tox -e $TOX_ENV

tox.ini

@@ -1,27 +1,44 @@
 [tox]
-envlist     = py27, py33, py34
+minversion      = 1.4
+envlist         = py27, py33, py34
+
+[pep8]
+exclude         = qpol.py
+max-line-length = 100
 
 [testenv:pep8]
-deps        = pep8
-commands    = pep8 setools/ setools/policyrep/ tests/ \
-                   seinfo seinfoflow sedta sesearch \
-                   --exclude qpol.py --statistics --max-line-length=100
+deps            = pep8
+commands        = pep8 --version
+                  pep8 setools/ tests/ seinfo seinfoflow sedta sesearch --statistics -v
 
-[testenv:coverage]
-deps        = networkx==1.9
-              coverage
-commands    = coverage erase
-              coverage run setup.py test
-              coverage report
+[testenv:py27-coverage]
+basepython      = python2.7
+deps            = {[testenv]deps}
+                  coverage
+commands        = coverage --version
+                  coverage erase
+                  coverage run setup.py test
+                  coverage report
 
-[testenv:coverage-html]
-deps        = networkx==1.9
-              coverage
-commands    = coverage erase
-              coverage run setup.py test
-              coverage report
-              coverage html
+[testenv:py33-coverage]
+basepython      = python3.3
+deps            = {[testenv]deps}
+                  coverage
+commands        = coverage --version
+                  coverage erase
+                  coverage run setup.py test
+                  coverage report
+
+[testenv:py34-coverage]
+basepython      = python3.4
+deps            = {[testenv]deps}
+                  coverage
+commands        = coverage --version
+                  coverage erase
+                  coverage run setup.py test
+                  coverage report
 
 [testenv]
-deps        = networkx==1.9
-commands    = {envpython} setup.py test
+deps            = networkx==1.9
+commands        = {envpython} setup.py test
+recreate        = True