Implement Calendar#getTime

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add minimal implementations of ParseException / ParsePosition

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Implement a minimal SimpleDateFormat

For the moment, this class can only handle dates of the form
"yyyy-MM-dd'T'HH:mm:ss".

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Test date parsing/formatting

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Merge pull request #82 from dscho/dates

Implement date parsing / formatting