Replace coala PEP8 checking with some alternative

[ghoshbishakh]

https://travis-ci.org/NIT-dgp/festcms

[ghoshbishakh]

@nkprince007 I tried updating coala and found that it has conflicting dependencies with some of its own bears. Just frustrating.

[ghoshbishakh]

@nkprince007 was this resolved?

[naveenkumarsangi]

Not sure. I'll let you know.

[naveenkumarsangi]

It should be ready now.

[ghoshbishakh]

@nkprince007 can you update and check?