Fix issue importing JSON strings containing line breaks.

Fixes #59

lib/twine/formatters/jquery.rb

@@ -35,6 +35,7 @@ module Twine
         open(path) do |io|
           json = JSON.load(io)
           json.each do |key, value|
+            value.gsub!("\n","\\n")
             set_translation_for_key(key, lang, value)
           end
         end

test/fixtures/test-json-line-breaks/consumed.txt

@@ -0,0 +1,5 @@
+[[Line Break Strings]]
+	[line_breaking]
+		en = This\nstring\ncontains\nline\nbreaks
+		tags = tag1
+		fr = This\nstring\nalso\ncontains\nline\nbreaks

test/fixtures/test-json-line-breaks/generated.json

@@ -0,0 +1,3 @@
+{
+"line_breaking":"This\nstring\ncontains\nline\nbreaks"
+}

test/fixtures/test-json-line-breaks/line-breaks.json

@@ -0,0 +1,3 @@
+{
+"line_breaking":"This\nstring\nalso\ncontains\nline\nbreaks"
+}

test/fixtures/test-json-line-breaks/line-breaks.txt

@@ -0,0 +1,4 @@
+[[Line Break Strings]]
+    [line_breaking]
+        en = This\nstring\ncontains\nline\nbreaks
+        tags = tag1

test/twine_test.rb

@@ -111,4 +111,20 @@ class TwineTest < Test::Unit::TestCase
   def test_generate_report_1
     Twine::Runner.run(%w(generate-report test/fixtures/strings-1.txt))
   end
+
+  def test_json_line_breaks_consume
+    Dir.mktmpdir do |dir|
+      output_path = File.join(dir, 'strings.txt')
+      Twine::Runner.run(%W(consume-string-file test/fixtures/test-json-line-breaks/line-breaks.txt test/fixtures/test-json-line-breaks/line-breaks.json -l fr -o #{output_path}))
+      assert_equal(File.read('test/fixtures/test-json-line-breaks/consumed.txt'), File.read(output_path))
+    end
+  end
+
+  def test_json_line_breaks_generate
+    Dir.mktmpdir do |dir|
+      output_path = File.join(dir, 'en.json')
+      Twine::Runner.run(%W(generate-string-file test/fixtures/test-json-line-breaks/line-breaks.txt #{output_path}))
+      assert_equal(File.read('test/fixtures/test-json-line-breaks/generated.json'), File.read(output_path))
+    end
+  end
 end