opencensus 0.11.0

• Updated azure, context, flask, requests modules

opencensus-context 0.1.3

• Move version.py file into runtime_context folder
  (#1143)

opencensus-ext-azure 1.1.6

• Add statusCode and exceptionType to network statsbeat
  (#1138)

opencensus-ext-flask 0.8.1

• Move version.py file into common folder
  (#1143)

opencensus-ext-requests 0.8.0

• Move version.py file into common folder
  (#1143)
• Add requests library as a hard dependency
  (#1146)