Turn on skip-postcompile-on-save, change asset set name

Turn on skip-postcompile-on-save, change asset set name

This changeset contains a couple of minor but unrelated changes:

(1) Turn on the "Skip packaging and dexing until export or launch"
    option. This option was added in ADT 12 by off by default. This
    turns it on at least for the preview build of ADT 14.

(2) Change the name of the Asset Set (which opens the asset studio
    wizard) to "Android Icon Set" to make it more obvious what it is.

(3) Tweaks some default collection sizes to avoid unnecessary growth
    copies when an SDK is loaded.

Change-Id: Ib2c575c247bbfb45345d0b067e3ea944f8a72d82