improve bs.obj code gen, prepare Bs_obj refactoring (+6 squashed commits)

Squashed commits: [912d993] clean up [0f656eb] use arg_type_spec_length instead [4696f2f] export Js.Obj fix bs.obj combination with bs.ignore [64eb581] prepare bs.obj simplification [eae10e7] fix -dsource , reduandent bs.obj [b61375c] bump version

Author: bobzhang

docs/Manual.html

@@ -640,7 +640,8 @@ <h1><a href="https://github.com/bloomberg/bucklescript">BuckleScript</a> User Ma
 </ul>
 </li>
 <li><a href="#_changes">Appendix A: CHANGES</a></li>
-<li><a href="#_1_02_dev">1.02 (dev)</a></li>
+<li><a href="#_1_03_dev">1.03 (dev)</a></li>
+<li><a href="#_1_02">1.02</a></li>
 <li><a href="#_1_01">1.01</a></li>
 <li><a href="#_1_0">1.0</a></li>
 </ul>
@@ -4146,7 +4147,13 @@ <h2 id="_changes"><a class="anchor" href="#_changes"></a>Appendix A: CHANGES</h2
 </div>
 </div>
 <div class="sect1">
-<h2 id="_1_02_dev"><a class="anchor" href="#_1_02_dev"></a>1.02 (dev)</h2>
+<h2 id="_1_03_dev"><a class="anchor" href="#_1_03_dev"></a>1.03 (dev)</h2>
+<div class="sectionbody">
+
+</div>
+</div>
+<div class="sect1">
+<h2 id="_1_02"><a class="anchor" href="#_1_02"></a>1.02</h2>
 <div class="sectionbody">
 <div class="ulist">
 <ul>