add array for tags with api routes and js xhr methods
add tags to sidebar
add instructions to create uniqe index on name in database
fixed bug in getTags function
added update contact op
full CRUD ops for contacts, switched from index to id using bson oid to id contacts
fixed http status codes/json messages
added gulp, commented app.py
fixed paths in gulpfile/ignored node_modules
ignored DS_Store
updated README w/ build tool instructions
shortened command for local gulp
refactored app/modified gulp/changed to valid db name
Merge pull request #4 from wuaiwuai/dev

Dev