doc improvments
add missing dos to manager.py
flake8
cleanup
update dev-requirements.txt
CFY-1133 make ctx importable
Bump version to 3.1m2 / 1.1m2
Merge pull request #34 from cloudify-cosmo/CFY-1133-importable-ctx

CFY-1133 make ctx importable
update dev-requierments.txt
CFY-1134 Added delete runtime property API to ctx object and NodeInstance class
Merge pull request #35 from cloudify-cosmo/CFY-1134-modify-runtime-properties-api

CFY 1134 modify runtime properties api
CFY-1049 use timeout property from bootstrap context
Merge pull request #36 from cloudify-cosmo/CFY-1049-policies

CFY-1049 use timeout property from bootstrap context
CFY-1124 runtime properties update now happens even if an error was raised in a plugin
CFY-1155 task name is now the same as the operation mapping (without the plugin name)
Merge branch 'master' into feature/CFY-1155-operation-mapping
make workflow ctx importable and also its parameters
fix unit tests
Merge pull request #40 from cloudify-cosmo/workflow-as-a-script

make workflow ctx importable and also its parameters
Merge branch 'master' into CFY-1124-openstack-plugin-atomicity-and-cleanup