Port on docs 2.10 branch this changes:

URL: http://svn.apache.org/r1535830
Log:
Add a link to wiki page for recording with 2.10


URL: http://svn.apache.org/r1535832
Log:
Add a link to wiki page for recording with 2.10 and clarify JMeter CA installation.

URL: http://svn.apache.org/r1535840
Log:
Added twitter follow and tweet

URL: http://svn.apache.org/r1535848
Log:
Add link

URL: http://svn.apache.org/r1535935
Log:
Typo

URL: http://svn.apache.org/r1535936
Log:
Few resize images / border size



git-svn-id: https://svn.apache.org/repos/asf/jmeter/branches/docs-2.10@1535939 13f79535-47bb-0310-9956-ffa450edef68