Merge pull request #14 from glennpratt/webapp

Fixes for integrating this version with store and webapp.
[#37516441] Merge allplayers.php branches master and guzzle-allplayers.
[#37516441] Client factory class separate from AllPlayers Client.
Merge pull request #10 from arturo-c/guzzle-merge

[#37516441] Merge allplayers.php branches master and guzzle-allplayers.
Add Travis-CI status badge.
Merge branch 'webapp' of github.com:AllPlayers/allplayers.php into update-from-webapp
Merge pull request #20 from glennpratt/update-from-webapp

Deprecate webapp branch.
[#41614903] Updated documentation for store endpoints that previously returned scalars.
[#38708827][#20019529] Add address field on create/update in Client
Merge pull request #24 from dbehrman/38708827_20019529_prepopulate_user_purchase_data

[#38708827][#20019529] Add address field on create/update in Client
Merge pull request #28 from jamesiarmes/store-return-updates

[SPRINTFIX][#41614903] Updated documentation for store endpoints that previously returned scalars
[#45534957] Updated line items index to include seller uuid parameter.
[#45535023] Added line item GET and PUT resources.
[#45535023] PSR-2 coding standard updates.
Merge pull request #31 from jamesiarmes/line-item-resources

[SPRINTFIX][#45534957 #45535023] Updated line item resources
[#50079207] Changed messagesGetBox() to work with changes in the public API.
[#50266257] Fixed ClientTest.php so that it will no longer have issues with capitalization.
Merge pull request #35 from jdarling91/FixClientTest

[#50266257] Fixed ClientTest.php so that it will no longer have issues with capitalization.
Merge pull request #33 from jdarling91/FixMessagesAfterAPIChange

[#50079207] Changed messagesGetBox() to work with changes in the public API.
[#51018277] Added line item creator UUID to appropriate resources.