Strict mode unit tests

[Simulant87]

Taken the changes from #937 preserving an attribution history of the authors commits:

fixes #935
fixes #933
resolves #927

In addition:

• Added missing Java doc
• Adopted tests from
  New unit tests for Strict mode using JSONTokener and JSONParserConfiguration #934
  Bugfix: NullPointerException thrown for invalid input on JSONTokener without strict mode #936

this can be taken as a discussion baseline, or merged instead or after #937 and makes #934 and #936 obsolete

[stleary]

@Simulant87 Please remove JSONArray, JSONObject, and JSONTokener as these have been merged in #937. The new unit tests may be kept.

[Simulant87]

I updated the branch, and it only contains missing JavaDoc and the new test cases now.

[stleary]

What problem does this code solve?
Add unit tests for strict mode. Also, clean up JSONTokener javadocs

Does the code still compile with Java6?
Yes

Risks
Low

Changes to the API?
No

Will this require a new release?
No

Should the documentation be updated?
No

Does it break the unit tests?
No. New unit tests were added.

Was any code refactored in this commit?
javadoc cleanup

Review status
APPROVED Starting 3-day comment window