add long description and categories to setup.py #15
install and usage documentation extracted from readme.md #15

although unit test directory split into two directories

*    utest-offline - unit test not interacting with TestLink
*    utest-online - unit test interacting with TestLink
README format changed to rst, file with release notes added  #15
api methods for platforms #10
createPlatform, getProjectPlatforms
addPlatformToTestPlan,removePlatformFromTestPlan
version set to v0.4.6
#10 #15
corrections in classifiers MANIFEST.in install.rst #15