Dev Test: Projectile Motion 1.0.0-dev.13

[andrealin]

Test Link: http://www.colorado.edu/physics/phet/dev/html/projectile-motion/1.0.0-dev.12/projectile-motion_en.html

Changes since last dev version:

• Keypad ranges (keypad allows you to enter values that are out of range projectile-motion#135)
• Fix objects with wrong rotation (A handful of objects have the wrong rotation when fired at 0 degrees projectile-motion#137)
• Add apex marker and prioritize it on the tracer tool
• Fix iPad2 bugginess ([iPad 2] Path, cannon, and tool clipping projectile-motion#129)
• New flatirons image (use of CU logo projectile-motion#142)
• Make probe on tracer tool draggable

[andrealin]

Updated test link: http://www.colorado.edu/physics/phet/dev/html/projectile-motion/1.0.0-dev.12/projectile-motion_en.html

With these updates:

• Fix algorithm for new trajectories (phetsims/projectile-motion@2bc0291)
• Make drag force label invisible if air resistance off (phetsims/projectile-motion@8b37ab5)

[andrealin]

Updated test link: http://www.colorado.edu/physics/phet/dev/html/projectile-motion/1.0.0-dev.13/projectile-motion_en.html

Should bring loading splash back.

[andrealin]

Done.