Merge pull request #239 from sailxjx/master

bug fix: `pm2 logs name` will not dump the expected process's log
Add ability to specify env variables in JSON
By not overwriting the env object in the JSON, it allow us to specify
env variables directly in the JSON.
Merge pull request #240 from LoicMahieu/master

Add ability to specify env variables in JSON
readme.md stuff
Fix pidFile -> pid_file configuration in examples and add to README
Merge pull request #241 from sudowork/pid_file

Fix pidFile -> pid_file configuration in examples and add to README
Merge branch 'master' of github.com:Unitech/pm2
incoming product description readme
readme update