Adding support for executeSelectQuery SOAP action.  Updated README.
Merge pull request #3 from MattMencel/multi-select

Adding support for executeSelectQuery SOAP action.  Updated README.
Added accessor at SysAid.server_settings
Added SysAid::Ticket.add_note() which mimics the text formatting of the SysAid web client
Bumped version
Added Activity support. Improved variable binding when creating and deleting tickets. Bumped version to 0.3.0.
Updated README with Activity examples
Removed unnecessary newline
Added SysAidException class
Added support to set SysAid.server_settings without using SysAid.login.