Updated with info about possibility of tracking upload progress

Before to know this, you'll have to inspect sources or try different auto-completes in IDE.
Merge pull request #58 from chester1000/master

Updated with info about possibility of tracking upload progress
Update README.md
add some logging for when a context dies

Change-Id: Idcfae97150bb6ef45af8b922d4bafa15dd8a1d6c
additional context death logging

Change-Id: I63af21a4602ca9f879fc5a175924ac8f8a3cf450
Merge branch 'master' of https://github.com/koush/ion

# By Koushik Dutta (3) and Maurycy Damian Wasilewski (1)
# Via Koushik Dutta
* 'master' of https://github.com/koush/ion:
  additional context death logging
  add some logging for when a context dies
  Update README.md
  Updated with info about possibility of tracking upload progress