Revert "Merge branch 'master' of https://github.com/nishant-jain/Middleware-dev"

This reverts commit 418fd2dfa7f6f37accec7851a28c2ba1dd11268e, reversing
changes made to 59695e0cc36b340635d2bdeeefaa7f90794f5112.
Revert "Revert "Merge branch 'master' of https://github.com/nishant-jain/Middleware-dev""

This reverts commit f971e9df63380c194b88dac30d9fbcaac5be817a.
Rolling back changes to the PubSubClient's file

...deletions.
Added apk, dex and class files to gitIgnore

For some git sanity!