add primary button, refine readme.

@@ -91,13 +91,13 @@
     <div class="form-inline">
         URL:
         <input type="text" id="txt_rtmp_url" class="input-xxlarge" value=""></input>
-        <button class="btn" id="btn_play_rtmp">播放RTMP</button>
+        <button class="btn btn-primary" id="btn_play_rtmp">播放RTMP</button>
     </div>
     <hr/>
     <div class="form-inline">
         URL:
         <input type="text" id="txt_hls_url" class="input-xxlarge" value=""></input>
-        <button class="btn" id="btn_play_hls"> 播放HLS </button>
+        <button class="btn btn-primary" id="btn_play_hls"> 播放HLS </button>
     </div>
     <div id="main_modal" class="modal hide fade">
         <div class="modal-header">

@@ -96,7 +96,7 @@
     <div class="form-inline">
         URL:
         <input type="text" id="txt_url" class="input-xxlarge" value=""></input>
-        <button class="btn" id="btn_play">播放视频</button>
+        <button class="btn btn-primary" id="btn_play">播放视频</button>
     </div>
     <div id="main_modal" class="modal hide fade">
         <div class="modal-header">

@@ -245,12 +245,12 @@
 <div class="container">
     <div class="alert alert-info fade in">
         <button type="button" class="close" data-dismiss="alert">×</button>
-        <strong><span>Usage:</span></strong> <span>输入地址后点击播放按钮</span>
+        <strong><span>Usage:</span></strong> <span>输入RTMP/HTTP地址后点击“播放视频”即可播放视频</span>
     </div>
     <div class="form-inline">
         URL:
         <input type="text" id="txt_url" class="input-xxlarge" value=""></input>
-        <button class="btn" id="btn_play">播放视频</button>
+        <button class="btn btn-primary" id="btn_play">播放视频</button>
     </div>
     <div id="main_modal" class="modal hide fade">
         <div class="modal-header">

@@ -215,7 +215,7 @@
     <div class="alert alert-info fade in" id="txt_log">
         <button type="button" class="close" data-dismiss="alert">×</button>
         <strong><span id="txt_log_title">Usage:</span></strong>
-        <span id="txt_log_msg">输入地址后点击发布按钮</span>
+        <span id="txt_log_msg">允许Flash访问摄像头，设置编码参数，点“发布视频”即可推流</span>
     </div>
     <div class="control-group">
         <div class="form-inline">
@@ -227,7 +227,7 @@
         <div class="form-inline">
             发布地址:
             <input type="text" id="txt_url" class="input-xxlarge" value=""></input>
-            <button class="btn" id="btn_publish">发布视频</button>
+            <button class="btn btn-primary" id="btn_publish">发布视频</button>
         </div>
     </div>
     <div class="control-group">