Fix/lychee 2.5

Fixes #6
#### Photos
* `takedate` and `taketime` were dropped in favor of `takestamp`
* `sysdate` and `systime` were dropped with no replacement
* `import_name` dropped. Using `title` to detect duplicates, though that certainly isn't perfect

#### Albums
* `sysdate` was changed to `sysstamp`.

#### README changes
* `python-mysql` is correctly named `python-mysqldb`
* Added `python-dateutils` as it's needed to `parse()` date strings into ints

2.5 database migration/changes can be seen [here](https://github.com/electerious/Lychee/blob/master/php/database/update_020500.php).