Extend install_gems.sh to just check for gems
|Target version:||Release 3.2|
for those users who prefer to use the distribution provided
gems library, it would be great if there is something to check
whether all required gems are installed. This would probably
help to avoid user problems due to missing gems.
This could be implemented by building upon install_gems.sh,
where a list of all required gems is known.
The new script would just check whether the required gems
can be loaded successfully.
A call to this script could be included in the solution to #914.