add Tower.app icon
increase jpegMini finder dialog delay
scope find executions to files only

fixes #43
increase delay for JPEGmini/Finder to resolve file system paths
harden handling of floats, ints, reals. refs #51
run pngquant on 8 cores in parallel when operating on a directory, refs #52
create temp directory for managing files
check availability of Apps and GUI scripting
run applications if enabled in command line options
simplify src structure
npm ignore Gruntfile
validate --directory value
correct path to applescript lib
apply normalisation of localised numbers, refs #51
wait for JPEGmini to use 0 CPU 3 times consecutively rather than 1, refs #54
1.6.23
use $TMPDIR instead of arbitrary directory
fix how temp directory write permissions are set
use extended RegExp to enable support for | in -iregex
separate bash functions into an imported library we can test