Beginning work on convertTimeFromTicks function
convertTimeFromTicks function nearly completed
Add more interrupt guards in filesystem code

Closes #91
Create new files if needed from openStreamWrite
Update openFile{Read,Write} to write entire handle
Add interrupt guards around closeStream
Update closeStream to handle writable streams

Also stubs out flush
Update page 0x00 jump table
Zero out the allocated stack for new threads
convertTimeFromTicks function working, needs testing
Removed platform limitation
Removed unnecessary comments, changed comment format
Merge pull request #95 from dragontux/time

Time function
Clean up time functions