added classes to support command execution limits

They aren't used yet.
leave the configured builder jarfile in user home
builder jarfile is now left in user's home
use amazon s3 site as $DOWNLOAD_SITE
Merge pull request #12 from daveho/master

more bootstrap.pl changes
Merge branch 'master' of github.com:cloudcoderdotorg/CloudCoder
Merged from cloudcoderdotorg/CloudCoder
changed CloudCoderBuilder to CloudCoderBuilder2
Merge branch 'master' of git://github.com/jspacco/CloudCoder
allow LATEST version to be in form vX.Y.Z
Merge pull request #13 from daveho/master

fix version number handling in bootstrap.pl
this script is useless
fixed various bugs
merge
Merge pull request #14 from daveho/master

bugfixes in bootstrap.pl
set webapp hostname in cloudcoder.properties

The builder needs this to connect to the webapp.
Merge pull request #15 from daveho/master

bootstrap.pl: set webapp hostname in cloudcoder.properties
another fix for a stupid bug in bootstrap.pl
Merge pull request #16 from daveho/master

fix another stupid bug in bootstrap.pl
add aws-java-sdk jarfile