Added a task to remove default tomcat apps

Task removes all unnecessary files in the webapps directory after
initial installation.
Changed command to shell

Shell is now used instead of command in an attempt to fix issues with
deletion.
Changed to a looped removal using the file module

File module used with a loop is replacing the shell module for removal
of files and directories, as this is a safer method of cleanup.
Fixed error where wrong keyword was used

Changed 'src=' to 'path=', as 'path' is the correct keyword in this
case.
Merge pull request #7 from ausaccessfed/feature/tomcat-cleanup

Added tasks to remove default Tomcat webapps