Merge pull request #9 from Betterment/adam/master/add-pin-to-credentials

Merging - will perform a maven release to version 0.2.2 shortly.
Added Adam Langsner as contributor
updated user-agent
[maven-release-plugin] prepare release plaid-java-0.2.2
[maven-release-plugin] prepare for next development iteration
Update README.md
Implemented support for realtime balance check
Implemented support for add product (upgrade)
Preliminary support for the Info product
fixed info
fixed auth
Merge pull request #10 from plaid/new-features

support for balance, upgrade and preliminary support for info (not testable right now)
[maven-release-plugin] prepare release plaid-java-0.2.3
[maven-release-plugin] prepare for next development iteration
Update README.md
Use the provided uri instead of the production uri
Merge pull request #11 from MHova/fix-hardcoded-uri

Use the provided uri instead of the production uri
[maven-release-plugin] prepare release plaid-java-0.2.4
[maven-release-plugin] prepare for next development iteration
Support for Account subtype and pendingTransaction references on
Transaction.