Fix #1222 -- split READ_MORE_LINK into RSS_ and INDEX_ versions

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
split in init.py

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
plural
New DEFAULT_RSS_READ_MORE_LINK

`<p><a href="{link}">{read_more}…</a> ({min_remaining_read})</p>'`
Merge pull request #1237 from getnikola/read-more-link-redux

Fix #1222 -- split READ_MORE_LINK into RSS_ and INDEX_ versions.