add a button to submissions page to show submissions for student
started working on UserProblemSubmissionsPage
get all sub receipts for user/problem in UserProblemSubmissionsPage
show submission source code in UserProblemSubmissionsPage
added prev/next buttons for iterating through student submissions
show test results for submissions in UserProblemSubmissionsPage
allow submissions to be viewed from UserProgressPage
add more things to .gitignore

Specifically, things that could be extracted from a
webapp or builder jarfile during the process of testing
configuration and/or upgrade functionality.
remove code for text delta debugging - hasn't worked in a long time
added javadoc
support getting text for user's first submission receipt

The user's first submission receipt will have its status set to
SubmissionStatus.STARTED, and does not correspond to any
full text change.  So, if the database is asked to get the
submission text for this kind of submission receipt, retrieve
the first full-text change, which will typically be the
problem skeleton.
minor placement tweak for slider on UserProblemSubmissionsPage
started refactoring of database code: move util classes into package
started to factor transaction classes into separate package
ensure db objects are cleaned up when getting User object
factored out an AuthenticateUser transaction class
factored a few more transaction classes out of JDBCDatabase
factor more transaction classes out of JDBCDatabase
factored another transaction class out of JDBCDatabase
more refactoring of transactions into separate classes