English fixes in README and CLI docs

Consistent English punctuation style (no space before ';', '?' and '!')
Removed the out-of-context "Test" section because it's duplicated under #a149 anyway
Consistent spacing for the `processes.json` section
More English fixes
More English fixes
English fix in pm2 shell script
Merge pull request #396 from StockBase/master

English fixes in README and CLI docs