[#291] Disable ObjectEntity falling flag when there is no gravity.

- Thanks @Deathspike for #478
Update version number to 1.0.1
[#482] Fix an exception in ObjectEntity.checkCollision()

- See: https://groups.google.com/d/msg/melonjs/w6UawD-I3Dw/SNY1cNy8wcEJ
- Reset the me.game.collisionMap reference to an empty collision map.
- The empty collision map is only created once at startup.
various audio improvements (see details)

- updated to the last howler v1.1.19 version
- re-fixed audio not working with the CocoonJS accelerated webGL view
(in Howler.js), see
https://github.com/goldfire/howler.js/commit/a9ea27abc0ec2f03e5df4be84c012bdee20484e8
- documentation fix for me.audio.resumeTrack()
Fixed a regression with breakable tiles (thanks nye1020)
[#484] removed the completely outdated UML diagrams
Sync'ed to last Howler official version, as it one now fully address all previous cocoonJS issues

Except for the stop/pause feature (untested so far with this version),
but based on the changelog, it should actually be the same than with
1.1.19
[#485] fixed a potential issue when ratio is defined to 0 in Tiled
[#462] now throws an exception when attempting to load audio before audio is initialized
CHANGELOG update
merged scaling first try
added in commit for coordinate fixes
switched the loop to have an escape
fixed merge conflict mistake
fixed font scaling
Merge branch '1.0.0-dev' into 1.0.x
GUI_Object tap and hold

Add tap and hold for GUI_Object. After item is clicked, timer starts to
run. If after timer ended, item is still clicked it means we are
holding it. Object registers “pointer up” event to check is item
released.
GUI_Object tap and hold

Fix tabs to spaces. Add me.timer.clearTimeout to onDestroyEvent
GUI_Object tap and hold

once more, tabs to spaces
GUI_Object tap and hold

tabs to spaces