Added setenv.sh file

A new file setenv.sh has been added to configure Tomcat memory settings.
Added new task to copy over setenv.sh

Task added to copy over setenv.sh into the bin folder. Also restarts
tomcat if necessary in order to ensure that changes take effect.
Changed file permissions to match other scripts

Changed file permissions for consistency with the other file permissions
of the other script files.
Merge pull request #36 from ausaccessfed/feature/tomcat-memory

Modified tomcat memory settings
Resolves #29