style: incremented version to 1.0.10 in cheshire3.internal
bugfix: discovering version number in setup.py

Catch ImportError when importing cheshire3Version cheshire3.internal
(e.g. due to unresolved dependencies in a source distribution). Fall
back to read from VERSION.txt

fixes #61 - https://github.com/cheshire3/cheshire3/issues/61
tests: added config for Travis continuous integration
tests: removed Python version specific pip install in Travis config
docs: added Travis CI build status to README
docs: added master branch to Travis CI build status in README
tests: removed unnecessary line from Travis CI config
docs: fixed formatting in CHANGES file
docs: updates CHANGES file for 1.0.10 release
Merge branch 'hotfix/1.0.10'