Add missing full stops
Format file/directory names as literals
Americanize spelling (utilise vs utilize)
Sync DropBox and CLI import arguments
Remove plonematch theme from ome-documentation repository

Sphinx theme for the HTML documentation has been moved to a standalone
repository https://github.com/openmicroscopy/sphinx_theme and is used to
generate documentation in the CI builds.

Only impact of this commit on local builds is that "-D html_theme=plonematch"
can not be used in the SPHINXOPTS envvar anymore.
Remove mention of plonematch theme in the main README
Remove plonematch html_theme from Travis build envvar
Fix  configuration section of continuous integration documentation page
merge dev_4_4 -D org -I include -E exclude: PR 368 (Cpp: Correct content and markup)
merge dev_4_4 -D org -I include -E exclude: PR 409 (Doc patch dropbox dev 4 4)
merge dev_4_4 -D org -I include -E exclude: PR 410 (Remove plonematch theme from OME documentation)