Closes #3

Closes #8

This is not a fix, but it might help identify the problem and in the meantime it won't cause the same problems
Started moving to Java 7.

Works only in gold mode

Allows for clickable presentation of bookmarks

When one of the two trees of the same annotation had a trace, the `predicateIndex` values where shifted resulting in a failed comparison.

Closes #6

Shows the position of the current annotation with respect to the rest of the annotations of the current utterance

Fixed issue #5

This was a bug that prevented adding annotations that were missing from one of the two corpora in the gold mode as MISSING

Useful for when one of the annotators has inserted (up to 2) extra nodes in the tree, moving the position/index of the predicates

-If checked, the annotation will be marked with annotator's name (instead of auto/babySRL)

-Bad practice, but will make distribution easier

 - YY, ER, LV, IE
Added alias info

-Congratulatory message at the end of the annotation
-Gold mode now shows files with annotations

Native MacOS look and feel

Auto-marked "gold" annotator doesn't count as a change

Brought back the incremental number IDs (as a menu option)

Catching all exceptions and casting them to messages rather than sending them to console
Removed the annotation index (first of two numbers) from the drop-down list
Modified the context window to add an indication if an utterance doesn't have SRL
 - Created a context-to-annotation map that can be used later on
 Added '=' as a shortcut for predicate
 Added list of commonly used shortcuts in the F1 menu
 Added a bracket-verification method during tree editing

 - Fixed reading of reference lists
 - Adjusted max size/resizing behaviour in Tree Edit window
Changed README to a markdown version

 - For now, simply lists of terminals/non-terminals
 - Rearranged the entire panel

Added double-click listener to the start screen lists.

Current context is now centered in context window
Switched CTRL key for a platform-independent mapping
Added code for the argument scope patch

Fixed crash with empty SRL annotations

Various bug fixes

Using JSON to store treebanks, contexts and annotations in the same file.
Optimised auto-saving mode; system now keeps all changes in memory and writes to file only on exit.
Added ability to edit tree in place.

- Added context from .CHA files (requires a separate .context file; see resource dir)
- Annotation resumes from last edited/saved example
- Colour-coded annotator box: red->automatic annotation, green->previously annotated data, grey->manually annotated
- tregex/tree surgeon integration (saves a separate .mrg.<annnotator> file; see treebank dir)