post get: update man page

fixes #509
mention `wp --info` in README
don't alter API response if the returned version happens to be the one we want

see #511
bump version to 0.10.1-alpha
remove executable bit from mustache templates
scaffold plugin-tests: create install-wp-tests.sh script

This makes it easier to run unit tests locally.
Merge pull request #513 from wp-cli/travis-template

scaffold plugin-tests: create install-wp-tests.sh script
add URL redirect warning (for 0.10.1 branch)

see #521
set version to 0.10.1
Merge changes from 0.10.1 into master