617 add extra dev and change requirements file to work wiht extras_require in setup.py. change .travis.yml to use pip install .[dev]

Author: j5awry

.travis.yml

@@ -7,7 +7,7 @@ python:
   - pypy
   - pypy3
 install:
-  - pip install -r requirements/develop.pip
+  - pip install .[dev]
 script:
   - inv cover qa
 after_success:

requirements/develop.pip

@@ -1,4 +1,3 @@
--e .[test]
 invoke==0.21.0
 flake8==3.5.0
 readme-renderer==17.2

setup.py

@@ -61,6 +61,7 @@ def pip(filename):
 install_requires = pip('install')
 doc_require = pip('doc')
 tests_require = pip('test')
+dev_require = tests_require + pip('develop')
 
 setup(
     name='flask-restplus',
@@ -74,9 +75,11 @@ def pip(filename):
     include_package_data=True,
     install_requires=install_requires,
     tests_require=tests_require,
+    dev_require=dev_require,
     extras_require={
         'test': tests_require,
         'doc': doc_require,
+        'dev': dev_require, 
     },
     license='BSD-3-Clause',
     zip_safe=False,