Updates to readme.md
#136 Added files for OSx auto updater
#137 Add OS to analytics
#136 Update URL switching based on OS
#136 Updater relaunch HearthStats.app on osx
#136 Return version number based on OS
#136 Included version-osx in OSx build build
Error logging improvements
Error logging improvements
Removed unused imports
Improved error reporting
Minor tweaks
#139 Performance and memory use improvements

Added a forced garbage collection after every fifth polling cycle so
that the Java JVM doesn’t GC in the middle of analysing the screen, and
doesn’t let memory use get out of hand. Also limited memory use of the
OS X bundle to 192MB. Seems to be reducing long pauses in the JVM that
might be the cause of events being missed.