update certs for azure migration (#5)

* add new certs

tls - update cas, append cas to system pool (#4)

* tls - update cas, append cas to system pool
* return error on common.RootCA func

Adding .gitignore

Merge pull request #3 from rigado/directMethodResponseTimeout

Adding subscribe timeout and response timeout to direct method responses

Merge pull request #3 from rigado/directMethodResponseTimeout

Adding subscribe timeout and response timeout to direct method responses

Merge pull request #2 from rigado/donald/credential-timeout

configurable credential lifetime

configurable credential lifetime

Merge pull request #1 from rigado/donald/mqtt-close-fix

always disconnect mqtt on close

Merge remote-tracking branch 'upstream/master'

Merge pull request amenzhinsky#26 from boonmathew/master

Added tags property in ModuleTwin