Use CocoaLumberJack logging framework

Added CDTQLogging.h file which contains macros to use
CocoaLumberJack logging framework. The log statements are
name spaced with the prefix CDTQ

Added doc describing logging

Added Error log statements to code base
Update README.md
Merge pull request #2 from cloudant/lumber_jack_logging

Lumber jack logging
Fix Cocoapods warning
Update to CDTDatastore 0.9.0 in Podfile.lock
Support $not operator

Index a blank row if document has no indexable fields
Add issue # where available to unsupported features
Implement limiting of results

Added support for limiting the number of results from a query. this
is implemented by filtering the results ruturned from the Query on the db
Rename offset to skip
Address PR Comments

Use NSUInteger instead of int for skip and limit params,
make find:query:indexes call to find:query:indexes:skip:limit
use subarrayWithRange instead of manual subarray creation
Add tests for exceding array bounds
Fix copy paste error
Remove accidental new line
Correct number of expected results and raise limit
Remove white space

Remove accidental space from commit
Changed range creation code

Handle ranges that are out of bounds correctly
use MIN macro to use limit of docIds count for range creation
Fix logic error