Add const.keepAliveTime test.
Add util.isNumeric() test.
Move util.mergeObjects to an arbitrary number of args.
Add util.mergeObjects test.
Add util._addOwnProperties test.
Move console protection in util.

This will allow testing.
Add util.enableConsoleProtection tests.
Merge pull request #99 from mcomella/test_const

Add const.keepAliveTime test.
Merge pull request #98 from mcomella/test_util

Add util tests
Add Readline keydown listener test.
Add Readline.submit test.
Add Readline.newer/older history tests.

These tests are only for an active command history.
Add Readline.newer/older empty history tests.
Add Readline.keydown down keystroke tests.
Add Readline.keydown up tests.
Make the describe lines more accurate for arrows.
Add Readline.keydown enter tests.
Fix broken tests.

The shell CSS was updated without updated the associated tests.
Add Shell.attachInputHandler test.
Add Shell.enableInput test.