Readability [skip ci]
README: Show how to change default AND grouping to OR

and show how attributes may be chained.

[skip ci]
README: improve OR grouping code examples and

mention that the dedicated branches may not immediately contain all the
latest updates from master. Add line spacing in the search_form_for
code example.

[skip ci]
README: Improve code examples [skip ci]
README: Add missing attribute [skip ci]
README:  move OR Grouping to its own section and

reorganize the sections a bit.

[skip ci]
README: Add an example of attribute chaining to the Associations

section, and improve the “Grouping queries by OR instead of AND”
section.

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README: fix Associations code example [skip ci]
README: Add OR grouping controller code example to

help clarify how it works and help people try it out.

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REAME: follow-up improvement to 677ebc7

[skip ci]
README: further improvements to OR grouping section

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README: OR grouping explanation follow-up [skip ci]
Begin a Ransack change log (work in progress)

[skip ci]
Improve the change log [skip ci]
add romanian translation
romanian translation bug - ups :)
fix ro translation for predicate present
Add example code to Scopes docs in README

[skip ci]
Follow-up to last commit [skip ci]
Follow-up to last 2 commits on Scopes/Class Methods docs

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