1. Enable logging via logger class. Eases logging to android
   activity
2. convert cout calls to logger print calls
3. xml dump of peak results. Implementation is not complete
xml dump almost feature complete. Some more beautifiation left.
xml dump can be used by vector-width aware applications for tuning
1. Add multi-level tags for xml dumps
2. Modify global-bandwidth test to run 2 kind of tests & take the
   best number out of those. One is cpu friendly and the other is
   gpu friendly