Update README.md

Fixes spelling error "you an" -> "you can"
Merge pull request #19 from alexberry721/master

Fixes spelling error
Update README.md

Incorporating edits. Mostly cleaning up nits. Also fixed a bit of code to reflect current way to create entities.
Merge pull request #20 from stevetraut/patch-1

Update README.md
Added helper function to build asset URLs
Change param in comments from endpoint to uuid
Merge pull request #21 from danielsimons1/buildAssetURL

Helper function to build asset URLs
Updated comment for Usergrid.Entity

UUID should be included in the nested 'data' json object not outside of it.
Merge pull request #24 from amuramoto/patch-2

Updated comment for Usergrid.Entity
Merge branch 'master' of github.com:apigee/usergrid-javascript-sdk

Conflicts:
	README.md
updated readme
updated change log