docs: cleanup of casing, markup and spacing of headings Mostly stuff found and fixed by Søren, extracted here to separate things. Other uses of title casing might be debatable, but here it was just a few documentation headings that clearly were inconsistent with the majority.

[tox]
minversion = 1.8
envlist = py{26,27}-{pytest,nose}

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    nose: nose
    pytest: pytest
commands =
    nose: nosetests {posargs}
    pytest: py.test {posargs}