Merge pull request #20 from damiansoriano/master

Modifications for Mocking Instagram
Updated InstagramException to handle 503 server unavailable error code.
[maven-release-plugin] prepare release jInstagram-1.0.4
[maven-release-plugin] prepare for next development iteration
Updated version in pom.xml
using string as min/max id. integer doesn't have the length to hold those values, and the pagination model from reponse is using string type for id too.
only enable gpg sign when gpg-sign is enabled explicitly: mvn -Dgpg-sign=true install
Merge pull request #22 from jerryrt/master

using string as min/max id. integer doesn't have the length to hold thos...
add instagram video support.
Merge pull request #23 from jerryrt/master

add instagram video support.
add full name field. old first name and last name are marked as
deprecated.
Merge pull request #24 from jerryrt/master

new model field.
Return a SubscriptionsListResponse on getSubscriptionList
corrected incorrect @SerializedName of callbackUrl to callback_url
Merge pull request #26 from nilo85/master

Fixed InstagramSubscription.getSubscriptionList()
Updated ErrorResponse.
Added info regarding commenting access.
instagram
Added unit-test for entity classes.

Fixed some FindBug errors.
Added mockito and junit dependency.