Merge pull request #27 from ptommassen/feature/ISSUE-21

- check preconditions of dialogs
Merge branch 'release/I_0.0.2.12_PRERELEASE'
[maven-release-plugin] prepare release mobbl-core-framework-0.0.2.12
[maven-release-plugin] prepare for next development iteration
Update README.md
- Using Maven 3.1.1
Merge branch 'release/Mvn3_1_1_approved'
[maven-release-plugin] prepare release mobbl-core-framework-0.0.2.13
[maven-release-plugin] prepare for next development iteration
Update README.md
fixed bug in [-MBElement asXMLWithLevel:], characters are now escaped correctly.
Added testing bundle target for unit testing
Merge pull request #29 from sven-m/feature/MBElement-asXML-fix

fixed bug in [-MBElement asXMLWithLevel:], characters are now escaped co...
Merge pull request #30 from sven-m/feature/setup-unit-tests

Added testing bundle target for unit testing
Merge branch 'release/I_0.0.2.14_PRERELEASE'
[maven-release-plugin] prepare release mobbl-core-framework-0.0.2.14
[maven-release-plugin] prepare for next development iteration
Update README.md