Modifications to get code building locally.

Fix Hammock & linq bridge references.

Remove regexoptions.compiled - not available in SL4 project, and regex
is being created each time method called and used only once in method,
so compiling it is probably unneeded overhead anyway.

Updated nuget package for json.net to 5.08, which appears to be the
latest one still supported WP 7.x.

Update some tests to use new values (seems like Twitter place data has
changed?).

Update some tests to use new values from config file (TwitPic key and
user name).

Changes to echo request test to make test pass, based on sample code for
making an echo request from main project page.

Remove RawSource property from ITweetable interface as it is inherited
from ITwitterModel anyway, and creates compiler warning.

Fix to entity coalescing test to handle retweets - entities in top level
tweets may not pass test requirements, and Twitter seem to acknowledge
this the case. Recommendation is to use the original tweet, which the
test now does.

Fix for Can_parse_hashtag_search_url test - it was checking for a hash
character in the query string for a hash tag search. That character
isn't returned as part of the entity or resulting url, and isn't
required for the url to be correct.
Reinstated request and access token methods using delegate based callbacks for SL and WP projeccts, as these are supportable on those platforms being non-blocking methods.
Add mono projects to tweetsharp solution so they get built with the other platforms.
Updates to prepare new nuget package

Moved version # attribute to separate assemblyinfoversion.cs file and
shared among all projects, so they all build with the same version
number. Built code. Updated nuget metdata, batch files, rebuilt package.