Cleaning the README, INSTALL and CHANGES file

(cherry picked from commit 528ac4c6e913b3e39b376965e744714e8496c4be)
Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Conflicts:
	INSTALL.md
README: add travis and coverity badges

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>