Added LruCache, which is dependent on android-support-v4.jar.

Modified onScreenTapped: the formula there now depends on if the picture is larger than the screen or not.

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   README
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
#
#	.idea/
#	imagemap.iml
#	out/
Merge pull request #7 from fess89/master

Added LruCache, which is dependent on android-support-v4.jar.