refactored presentation logic into submodules, adding builds, put presentation controller into buildspec
odfimport: reading and converting build data of odp presentations
odf/odp: ODFFormulaParser
run_tests.js: lively.data.tests.ODFImport
presentation builds: #initBuildSteps
presentation: controller is build aware (nextStepOrSlide, prevStepOrSlide)
presentation: removing lively.Presentation
presentation: openPresentationController command
presentation: World>>openPresentationController
paths: small cleanup
Merge branch 'presentation-refactoring'