add missing author feeds to pelicanconf template
EXTRA_PATH_METADATA path separator is OS-specific

Updating docs for EXTRA_PATH_METADATA to clarify that OS-specific path
separators must be used as keys, unlike some other Pelican variables.
Refs # 1133.
Spelling correction in docs: usefull -> useful.
Merge pull request #1487 from foresto/spelling

Spelling correction in docs: usefull -> useful.
Merge pull request #1484 from ingwinlu/complete_rss_feed_removal

add missing author feeds to pelicanconf template
fix missing tab in Makefile template
Merge pull request #1511 from olivierverdier/makefile_tab

Fix missing tab in Makefile template
Make StaticGenerator skip content sources. Refs #1019.

This change partially addresses issue #1019, by teaching Pelican to distinguish
between static files and content source files. A user can now safely add the
same directory to both STATIC_PATHS and PAGE_PATHS (or ARTICLE_PATHS). Pelican
will then process the content source files in that directory normally, and
treat the remaining files as static, without copying the raw content source
files to the output directory. (The OUTPUT_SOURCES setting still works.)

In other words, images and markdown/reST files can now safely live together.

To keep those files together in the generated site, STATIC_SAVE_AS and
PAGE_SAVE_AS (or ARTICLE_SAVE_AS) should point to the same output directory.

There are two new configuration settings:

STATIC_EXCLUDES=[]  # This works just like PAGE_EXCLUDES and ARTICLE_EXCLUDES.
STATIC_EXCLUDE_SOURCES=True  # Set this to False to get the old behavior.

Two small but noteworthy internal changes:

StaticGenerator now runs after all the other generators. This allows it to see
which files are meant to be processed by other generators, and avoid them.

Generators now include files that they fail to process (e.g. those with missing
mandatory metadata) along with all the other paths in context['filenames'].
This allows such files to be excluded from StaticGenerator's file list, so they
won't end up accidentally published. Since these files have no Content object,
their value in context['filenames'] is None. The code that uses that dict has
been updated accordingly.
Merge pull request #1509 from foresto/static-files-anywhere

Make StaticGenerator skip content sources. Refs #1019.