Make Travis builds work

- Work around Ubuntu not packaging flake8
- Fix requirements and setup dependencies
- Drop python-2.6 support (python-gssapi doesn't work)
- Call nosetests for portability
- Move manipulation logic into scripts

Signed-off-by: Robbie Harwood <rharwood@redhat.com>

Author: frozencemetery

.travis.install.sh

@@ -0,0 +1,9 @@
+#!/bin/bash -ex
+
+if [ $(python -c 'import sys; print(sys.version[:3])') == '3.6' ]; then
+   pip install flake8
+fi
+
+pip install -r requirements.txt
+
+pip install .

.travis.sh

@@ -0,0 +1,7 @@
+#!/bin/bash -ex
+
+if [ ! -z $(which flake8) ]; then
+    flake8
+fi
+
+nosetests

.travis.yml

@@ -1,19 +1,11 @@
-sudo: required
-
 language: python
 python:
-    - "2.6"
     - "2.7"
     - "3.4"
     - "3.6"
 
-before_install:
-  - sudo apt-get update -qq
-  - sudo apt-get install flake8
-
 install:
-  - pip install .
+  - bash -ex .travis.install.sh
 
 script:
-  - flake8
-  - py.test test_requests_gssapi.py
+  - bash -ex .travis.sh

requirements.txt

@@ -1,2 +1,2 @@
 requests>=1.1.0
-pykerberos >= 1.1.8, < 2.0.0
+gssapi

setup.py

@@ -49,7 +49,7 @@ def get_version():
     version=get_version(),
     install_requires=[
         'requests>=1.1.0',
-        'pykerberos>=1.1.8,<2.0.0',
+        'gssapi',
     ],
     test_suite='test_requests_gssapi',
     tests_require=['mock'],