Update README.md
Changed chdir to cd for changing directories
Merge pull request #224 from watercrossing/chdirFix

Changed chdir to cd for changing directories
Add in real-time service
force an npm rebuild to work around issue #129, missing bcrypt bindings file

see https://github.com/npm/npm/issues/5400
Merge pull request #229 from sharelatex/force-npm-rebuild

force an npm rebuild to work around issue #129, missing bcrypt bindings