Merge pull request #138 from mohsen1/master

Add NPM and Bower package references
Added libs written by Signalfx
Merge pull request #140 from signalfx/signalfx-libs

Added libs written by Signalfx
Update 2.0.md

proof reading
Merge pull request #141 from paulhill/patch-18

Update 2.0.md
merged PR for schema updates
Fixed "swagger" value to string
Made header "type" required
Update the spec, mostly with security.

1. Added security.
2. Added missing vendor extensions for operations.
3. A few cosmetic fixes.
4. Made various clarifications regarding parameters (types, mime types,
limitations).
5. Changed serializable object to header object and added a description
property to it.
Update version in package.json for json-schema-official