ENH: adding travis and coveralls setup

It squeezed following commits:

ENH: install nibabel (and remove installation of not needed gamin)
BF(travis): easy_install is unversioned
travis -- no Python matrix, use system-wide modules, install scipy (numpy) and nibabel from pkgs

.travis.yml

@@ -0,0 +1,16 @@
+# vim ft=yaml
+# travis-ci.org and coveralls definition for NeuroSynth build
+language: python
+python:
+  - "2.7"
+virtualenv:
+  system_site_packages: true
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -qq python-scipy python-nibabel
+install:
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then pip install -q coveralls; fi
+script:
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then coverage run --rcfile=.travis_coveragerc setup.py test; else python setup.py test; fi
+after_success:
+  - if [[ $TRAVIS_PYTHON_VERSION == 2.7 ]]; then coveralls; fi

.travis_coveragerc

@@ -0,0 +1,5 @@
+[run]
+branch = True
+omit =
+    /usr/*
+    /home/travis/virtualenv/*