Update version file in prime-factors

* Regenerate exercise READMEs to pick up tweaks to problem description

The upstream problem specifications have been updated with various
formatting changes, whitespace changes, and clarifications to the description.

This pulls in all the recent changes.

* Inline the exercise README insert

Now that we're operating with a track-wide template for generating exercise
READMEs we no longer need a separate markdown document to use for hints
and instructions that apply to all the exercises in a track. These instructions
can be defined directly in the template.

update palindrome-products

complex-numbers: remove 'classes' as topic

Delete unnecessary template override

The README template for the 'forth' exercise was not meaningfully different than
the default template.

The only difference when regenerating the README is whitespace.

This deletes the extraneous template for the sake of simplicity.

rename plf HINTS and regenerate READMEs

parallel-letter-frequency: Rename hints file to match convention

etl: add version file #1156

Updated test for sum of multiplies #1253

Added version file for proverb #1130

sum-of-multiples: updated the version #1131

gigasecond: Version file updated for #1125

update READMEs

* version 1.3.0 added to nucleotide-count

* tests added

* removed duplicate

* added exception throwing statement

* refactored to fit the canonical data

* Tests made more thorough

* Updated to throw Illegal ArguementException

* Remove unnecessary Tests

* Remove @Ignore

* Braces added

* Shifted checking to constructor

Version 2.1.0 added to food-chain #1153

Remove two-fer test

* Create Version File for Twelve-Days Challenge

Takes care of part of #1135

* Update TwelveDays.java

Checked and revised code up to the comment. Will finish the rest soon.

* Update TwelveDaysTest.java

Closes #1135

Quick question: Why add two new lines after each verse in the methods testing for multiple verses?

* Update TwelveDaysTest.java

Fixing based on reviews

* Update TwelveDaysTest.java

Fixed error

* Update TwelveDays.java

* Update TwelveDaysTest.java

Sieve Update

1.0.0

Details at #1134

largest-series-product: update tests to version 1.1.0

hello-world: added version file

allergies: added hints about no starter implementation

pascals-triangle: added hints about no starter implementation

bob: added hints about no starter implementation

bracket-push: added hints about no starter implementation

series: added hints about no starter implementation

atbash-cipher: added hints about no starter implementation

Added version file to hello-world exercise. Fixes #1120

Added a hints.md file to the atbash-cipher exercise and generated
the README.md file again using configlet. Fixes #1098

Added a hints.md file to the series exercise and generated
the README.md file again using configlet. Fixes #1096

Added a hints.md file to the bracket-push exercise and generated
the README.md file again using configlet. Fixes #1095