NTA-75 Update to check tx != null in txPrepareFailed
Merge pull request #69 from zhfeng/NTA-75

NTA-75 Handler throws NullPointerException when parsing the partial log files
NTA-63 Update DEFAULT_ITEMS_PER_PAGE
NTA-61 Add explanatory text to the log upload box
NTA-64 Update the pom.xml to add the missing information and maven-source-plugin
Merge pull request #70 from zhfeng/NTA-61_NTA-63_NTA-64

update
Merge branch 'master' of github.com:jbosstm/transaction-analyser into Feature/NTA_Restapi
Feature/NTA_Restapi

Moved Get and GetById methods to a generic Common Service interface.
Added two specific interfaces for Transaction and ResourceManager which extends Common Service interface.
Updated the implementation of the service classes to implement Common Service interface.
Updated the REST API to return bad request for a entity that does not exists in the system.