Improve JSON error handling.

Add support for detection of invalid line breaks in JSON string values.
Fixes #137. Could be improved to fetch the column number and drop the
messy grabbing of the line number from the exception message via regex,
but currently the "jsonlint" library (not to be confused with
"json-lint") only emits an error string. Since this is also the library
that drives http://jsonlint.com, we'll accept the messy regex in return
for more robust error checking when our default json-lint path fails.

All of the above only necessary because standard JSON.parse error
handling is broken in all environments. : )

src/utils/syntax-error-ex.coffee

@@ -4,6 +4,8 @@ Definition of the SyntaxErrorEx class.
 @license MIT. See LICENSE.md for details.
 ###
 
+
+
 ###*
 Represents a SyntaxError exception with line and column info.
 Collect syntax error information from the provided exception object. The
@@ -13,13 +15,21 @@ See: http://stackoverflow.com/q/13323356
 @class SyntaxErrorEx
 ###
 
-SyntaxErrorEx = ( ex, rawData ) ->
-  lineNum = null
-  colNum = null
-  JSONLint = require 'json-lint'
-  lint = JSONLint rawData, { comments: false }
-  this.line = if lint.error then lint.line else '???'
-  this.col = if lint.error then lint.character else '???'
+class SyntaxErrorEx
+  constructor: ( ex, rawData ) ->
+    lineNum = null
+    colNum = null
+    JSONLint = require 'json-lint'
+    lint = JSONLint rawData, { comments: false }
+    [@line, @col] = [lint.line, lint.character] if lint.error
+    if !lint.error
+      JSONLint = require 'jsonlint'
+      try
+        JSONLint.parse rawData
+      catch
+        @line = (/on line (\d+)/.exec _error)[1]
+
+
 
 SyntaxErrorEx.is = ( ex ) -> ex instanceof SyntaxError
 module.exports = SyntaxErrorEx;