[cosmetics] Pretty-align some code
[command] Introduce 'Remove unused @prefix directives' command

Checks which prefixes are declared but unused and removes them. The
user will be informed about any deletions.
[command] Introduce 'Convert to format' menu command

Allows easy conversion between common RDF serialization formats.
Depends on Raptor.
Rearrange menu items
[help] Update README to reflect recent additions
[issue-3][issue-4][grammar] Minor bugfixes concerning comments and rdf:type shorthand a

+ rdf:type shorthand a isn't properly recognized inside bnode literal
   see: https://github.com/peta/turtle.tmbundle/issues/3
+ Comments not properly recognized in all contexts
   see: https://github.com/peta/turtle.tmbundle/issues/4
[autocomplete][ui] Renamed item icons and add one for Properties
[autocomplete] Supply image names for list items

+ Supply image names for list items
+ Change code involving access to previously global Constants/Functions
Add support for list item icons and move all global constants/funtions into Turtle module

+ Add support for list item icons (explicitly load them)
+ Move all global constants/funtions into Turtle module
+ Change how methods resource(id) and resources() retrieve their
elements
[autocomplete] Order items by resource type and name / add icon for unknown types

+ Resource items are now ordered by multiple criteria: 1. by type 2. by
their name
+ New icon for unknown types (empty gray circle)
[grammar] Introduce language grammar for SPARQL

Actually just an empty scope with having source.turtle injected. Used
to have an additional source.sparql scope so that commands and themes
can hook in.
[command] Introduce command for executing SPARQL queries

Pretty cool feature ... it supports magic comments for specifying
SPARQL/SPARUL endpoints against which queries are automagically
executed.  It somehow transforms TextMate into an interactive SPARQL
shell.

https://gist.github.com/peta/1f245dd239e263429236
[command] Enable autocompletion for SPARQL documents

Add support for source.sparql scopes
[command] Introduce "Un-/comment selection"

Just toggles between un-/commenting the currently selected lines
[grammar] Extend SPARQL grammar with support for builtin functions

+ Add support for builtin functions
+ Differentiate scopes
[autocomplete] Introduce simple autocompletion for SPARQL 1.1 keywords/functions

Just simple ESC completion
[command] Improve 'Execute SPARQL Query' command

+ Make use of TM's web_preview lib
+ Remove HTTP request timeout limit
+ Fix escaping of query text for HTTP Get request
+ Wrap query execution with a progress dialog that allows the user to
abort execution process
[README] Update README and screenshots to reflect recent additiions
[cosmetics] Some minor changes
[command] Fix section parsing algorithm of 'Execute SPARQL Query'

+ It should exclude lines containing section markers
+ Start line numbering at zero and thereby fix bug in section parsing
algorithm