Added Lp_RPC_LPException which allows passing error data and implemented it at Lp_RPC_LPClient; Raised version number to 1.0.39;
Merge tag 'v1.0.39' into develop

v1.0.39 - added LPException
Merge branch 'feature/144' of github.com:littlepostman/sdk-server-php into develop
[#versionBump] - v1.0.40
Merge branch 'release/1.0.40'