Add Keyword: get email subject

[johannesx75]

Added new Keyword to get the subject of an email.

[memcmp]

sorry, i didn't see that pull request. Could you please merge the master branch?

[winko]

Hi everybody!

Why the keyword for "Get Email Subject" is not working currently?

I think it will be very useful keyword!

Regards

[schwendinger]

Deprecation Warning +++++++++++++++++++

Lovely Systems does not not support this package anymore and do not have any follow up package in the same area. If anyone is interested to continue our efforts and would like to manage the contributors in this open source project, feel free to fork the package and give me a hint, so I can create a link to your fork!

best regards, Manfred (Github: schwendinger, schwendinger at lovelysystems.com)