you can now easily add a custom date Scrubber

closes #682 #667

new factory methods to get DateScrubbers for sql.Date, util.Date and Timestamp

DateScrubber can handle Timestamp's toString()

Fixes #650

When working with the file ./name.txt:

getAbsolutePath() will resolve this to /path/to/./name.txt

instead of the desired /path/to/name.txt.

getResolvedPath() solves this problem.

Also, temp folder works when running tests in multi-threaded mode

Also:
Added StringUtils.ensureEnding
Added FileUtils.readFile(file, ensureTrailingNewline = true)

Closes #637

Just like ApprovalTests.Python, we now write a .gitignore file into our temp directory, thus consumers of the library don't have to add the folder themselves to their project's gitignore.

Once now supports running tasks asynchronously.

Bugfix

Downloading the approve_all script now is done asynchronously, meaning it won't affect build times.
Closes #615

Fixes bug #446