merge https://github.com/facebook/fbthrift/pull/29

Summary:
merge https://github.com/facebook/fbthrift/pull/29

Fixes install on 14.04, where egg zipping is the default, but the Makefile.am's don't account for it

Test Plan: davejwatson couldn't repro, trusting our users on this one

Reviewed By: ckwalsh@fb.com

Subscribers: doug, ruibalp, alandau

FB internal diff: D1560712
Update build script

Summary: update build script from 12.10 to 14.04, and update README.md

Test Plan: build on ubuntu

Reviewed By: haijunz@fb.com

Subscribers: doug, alandau

FB internal diff: D1560800
Update build script

Summary: update build script from 12.10 to 14.04, and update README.md

Test Plan: build on ubuntu

Reviewed By: haijunz@fb.com

Subscribers: doug, alandau

FB internal diff: D1560800
Bump version to 7:0