Revert "Test for specific South version as well"

This reverts commit 3d789f91.

.travis.yml

@@ -7,7 +7,6 @@ env:
     - DJANGO_VERSION=1.6.5 TRAVIS_DATABASE=mysql TRAVIS_RUN_TESTS="weblate.trans weblate.lang weblate.accounts"
     - DJANGO_VERSION=1.6.5 TRAVIS_DATABASE=postgresql TRAVIS_RUN_TESTS="weblate.trans weblate.lang weblate.accounts"
     - DJANGO_VERSION=1.6.5 TRAVIS_DATABASE=sqlite TRAVIS_RUN_TESTS="weblate.trans weblate.lang weblate.accounts"
-    - SOUTH_VERSION=0.7.3 DJANGO_VERSION=1.6.5 TRAVIS_DATABASE=sqlite TRAVIS_RUN_TESTS="weblate.trans weblate.lang weblate.accounts"
 #  global:
 # Sauce labs setup
 #    - secure: "W4EtqCQSbSWb2sDwHd0obttzUTKIPyFZE90qD+YdV76YLgIK7QX4Vc6Hx9fRRNy397h4RrYIzyU2vemGIR5j8cR16Y6MyJ8Fy4DyC2mHyo3T7Tx4/cJYTQDPF2G4kxjR+vmhsdQIdmaYLsjtb2C2M0aIkU8FGFv6D3+TXqsoOmI="
@@ -18,7 +17,6 @@ before_install:
 # commands to install dependencies
 install: 
   - pip install Django==$DJANGO_VERSION
-  - if [[ -n "$SOUTH_VERSION" ]] ; then pip install South==$SOUTH_VERSION ; fi
   - pip install -r requirements.txt
   - pip install -r requirements-optional.txt
   - pip install -r travis/requirements.txt