(SERVER-4) Eliminate direct file slurping

Slurp a FileInputStream rather than directly slurping the
/proc/meminfo file. This is due to a bug in OpenJDK wherein
the FileInputStream.available() method throws an exception when
called on a file in the /proc folder. Slurp a FileInputStream
rather than the file directly eliminates the call to this method.
(SERVER-4) Add comment about FileInputStream

Add a comment explaining why a FileInputStream is needed when
parsing /proc/meminfo.
Merge pull request #205 from fpringvaldsen/server-4-jenkins-fix

(SERVER-4) Eliminate direct file slurping