fix(sourcemaps): change tsconfig to set correct relative path

Closes angular#142

Author: jeffbcross

tsconfig.json

@@ -8,6 +8,7 @@
     "outDir": "dist",
     "rootDir": "src",
     "sourceMap": true,
+    "sourceRoot": "./",
     "declaration": true,
     "removeComments": true
   },

tsconfig.publish.es5.json

@@ -8,6 +8,7 @@
     "outDir": "dist",
     "rootDir": "src",
     "sourceMap": true,
+    "sourceRoot": "./",
     "declaration": true,
     "removeComments": true
   },

tsconfig.publish.es6.json

@@ -7,6 +7,7 @@
     "outDir": "dist/es6",
     "rootDir": "src",
     "sourceMap": true,
+    "sourceRoot": "./",
     "declaration": true,
     "removeComments": true,
     "moduleResolution": "node"