Fix package description

Update README.rst

Using setup_requires causes problems with pip

Bump version to 2.1.0

Rvaf (#15)

* replace ratio by rVAF and add some documentation

* improve test

add graphic option (#12)

Successful migration to python3 (tests pass) (#10)

* Successful migration to python3 (tests pass)

* Update README.rst

* Update easy_install.sh

* Update .travis.yml

* Update all_install.sh

* Update .travis.yml

* Update installtion scripts

* Update readme

Allow absence of 'chr' in chromosome names

Allow absence of 'chr' in chromosome names