.travis.yml & requirements.txt: some fixes

* Install Limnoria.
* Don't specify Python version.
    * I am curious if this is possible.

.travis.yml

@@ -1,8 +1,8 @@
 language: python
-python:
-  - "2.7"
 # command to install dependencies
-install: "pip install -q -r requirements.txt --use-mirrors"
+install: 
+    - "pip install -r https://raw.githubusercontent.com/ProgVal/Limnoria/master/requirements.txt"
+    - "pip install -r requirements.txt"
 # command to run tests
 script: sphinx-build -nW -b html -d _build/doctrees . _build/html
 # Flags used here, not in `make html`:

requirements.txt

@@ -1 +1,2 @@
 sphinx
+pip install git+https://github.com/ProgVal/Limnoria.git@testing