fix #1035 do scraping tests on mock data

don’t store scraped pages with licensed lyrics in repo
nosetests: don't run slow tests by default
Added backed audiotools to replaygain module and updated documentation
doc: emphasize options names by using bold font instead of fixed width
docs: sort plugins listings in alphabetic order
Encode to ascii,not utf8.Replace missing chars
Merge pull request #1073 from multikatt/discogs_encodeerr

Problem with non-ascii characters when using the discogs plugin and oauth PR
Comment about workaround in #1073
Merge pull request #1072 from Kraymer/doc-sort-plugins

docs: sort plugins listings in alphabetic order
Merge pull request #1071 from Kraymer/doc-boldify-options

doc: emphasize options names by using bold font instead of fixed width
Bold options in lastimport docs (#1071)
docs: convert.rst, fix options order
docs: keyfinder.rst, sort options
docs: spotify.rst, went through the net of mighty regex
Sort plugins pages alphabetically so navigating docs with previous/next buttons
is more predictable.
Merge pull request #1074 from Kraymer/docs_sort_plugins_pages

docs: sort plugins pages alphabetically
Move script to download pages out of tests_lyrics.py

By default (as runned by CI tools), only *fake* example.com page is present in
rsr/lyrics and tests that check content of pages coming from *real* sources are
thus skipped.
Execute lyrics_download_samples.py to download pages from *real* sources. When
done and *real* pages are present on disk, no tests are skipped.
Move script to download pages out of tests_lyrics.py

By default (as runned by CI tools), only *fake* example.com page is present in
rsr/lyrics and tests that check content of pages coming from *real* sources are
thus skipped.
Execute lyrics_download_samples.py to download pages from *real* sources. When
done and *real* pages are present on disk, no tests are skipped.
Limit result set sizes (fix #1068)
fetchart: add 'sources' option

Fasten cover search by enabling engines selection and prioritisation.