update changelog.
generated pot file

Current one is very old. All po files should be merged with this new pot file.
updated for new pot file
only set If-Modified-Since header if lastmodified != 0.
Merge branch 'master' of github.com:akrennmair/newsbeuter
Merge pull request #100 from donnut/master

update pot and nl.po fle
merge .po files with new .pot file.
fix fuzzy strings in de.po file.
reuse old google_api.h file.
add support for theoldreader.com.
make unread items easier to read.
replace googlereader commands with oldreader commands in documentation.
popular items are not supported by The Old Reader.
Add support for NewsBlur

Quirks:

* NewsBlur doesn't include the title when querying a single feed, so we cache
  it locally
* Credentials are stored via cookies. Cookies are stored in curl handles which
  are recreated for every request. The user has to specify a "cookie-cache".
Merge pull request #102 from t-8ch/newsblur2

Add support for NewsBlur
actually use oldreader-min-items (fixes #104).
empty items for search dummy feed before filling it with search results (fixes #101).
make sure view gets configuration before commands are executed with -x commandline option (fixes #91).
Merge remote-tracking branch 'upstream/master'