Remove naive verification of tuple size

This verification will not work.
Think of spaces or escaped ?
I think it's easier for users to parse the SQLException

Author: Moritz Schubotz <github@ckurs.de>

Closes #116 from physikerwelt/patch-1 and squashes the following commits:

69a3d2a [Moritz Schubotz] Remove associated test as well
b51b4f0 [Moritz Schubotz] Remove naive verification of tuple size
Remove space after comma for TupleXX.toString()

It is better to save some bytes when writing the output. Users can always overwrite to `toString()` if they want.

Author: Robert Metzger <rmetzger@apache.org>

Closes #118 from rmetzger/benchFixes and squashes the following commits:

cb8a251 [Robert Metzger] Remove space after comma for TupleXX.toString()
Remove CONTRIBUTORS file to prefer dynamically generate it

Per discussion in the dev@ list, maintaining the CONTRIBUTORS file manually is hard to do.

Most ASF projects defer this to team page or retrieveing it from JIRA or git commit list
for every release if needed.

This PR proposes to remove it and defer to dynamically created per release.

Author: Henry Saputra <henry.saputra@gmail.com>

Closes #123 from hsaputra/remove_contributors_file and squashes the following commits:

e235cbc [Henry Saputra] Per discussion in the dev@ list maintaining the CONTRIBUTORS file manually is hard. Most ASF projects defer this to team page or retrieveing it from JIRA or git commit list for every release.
[FLINK-989] Improve error message when not finding enough task slots.
[FLINK-1030] Refactor and clean up instance managers.
[FLINK-1094] Reworked, improved, and testes split assigners
Redesign Scheduler from pre-assignment to more flexible schedule-on-demand model
Adapt RPC to support primitive types as parameters and return values.
Redesign Scheduler part 2
Unify all job vertices to one type (rather than dedicated input/output types)
Make IDs immutable and serializable.
Stubs for intermediate data set and related classes
Refactor job graph construction to incremental attachment based
Remove management graph and simplify historic job status
Introduce execution attempts at execution vertex.
Add tests for job event classes
Finalize ExecutionGraph state machine and calls
Adjust ExecutionGraph state machine to TaskManager's failing model (direct transitions to canceled)
Adjusted job graph generator to new job graph classes
Adjust test logging for new execution graph tests to logback framework
Add proper locality of scheduling tracking to scheduler. Add local scheduling to slot sharing groups.