Switch to new “no CAPTCHA”

From PRs by @pupi1985 (unmergeable due to file structure changes).
Closes #69.
Closes #126.

json_encode and json_decode functions for use in PHP 5.1

Set to Unix line endings in repo; the gitattributes file means they
will be converted to suit the user’s system.

Fixes #118

The init_queries plugin function now receives table names in original case.
Potentially breaking change if qa_db_add_table_prefix is manually wrapped with strtolower, however, I have not found any code in the wild that would break from this change.
Q2A core code also now using case-sensitive comparisons (there were several instances of tables not being normalized anyway).
Fixes #45.

Also set a readable default size and some more code formatting.

The user is now able to configure the minimal size of the tags when dynamically scaling them.

Now using CKeditor 4.3.3 via lightweight custom build.
Upgraded wysiwyg-editor to use PHP 5 code.
Closes #5.