Added dependency file, updated version to 1.0.0-rc.1
Merge branch 'master' into 1.0
Updated version to 1.0.0-rc.2.
Updated.
Merged in changes from master for several fixes.
Bumped the version number to 1.0.0-rc.3
Updated version of scenery-phet used so that SubSupText is available.
Modified the labels "meters" and "feet", which is used for the grid labels in some cases, to be "m" and "ft".  See #48.
Added labels for 0 meters and feet for the 2nd and 3rd pool configurations.  This is more consistent with the 1st and 4th pool configurations.