Deprecated '--exclude-build-folder' (#354)

* deprecated

* fix an extra space

docs/en/manuals/bob.md

@@ -70,8 +70,8 @@ usage: bob [options] [commands]
                                          create an empty Defold
                                          application for use as a build
                                          target
-    --exclude-build-folder <arg>         Comma separated list of folders
-                                         to exclude from the build
+    --exclude-build-folder <arg>         DEPRECATED from Defold 1.5.1! Use
+                                         '.defignore' file instead
  -h,--help                               This help message
  -i,--input <arg>                        Source directory. Default is
                                          current directory

docs/ko/manuals/bob.md

@@ -58,8 +58,8 @@ usage: bob [options] [commands]
                                          create an empty Defold
                                          application for use as a build
                                          target
-    --exclude-build-folder <arg>         Comma separated list of folders
-                                         to exclude from the build
+    --exclude-build-folder <arg>         DEPRECATED from Defold 1.5.1! Use
+                                         '.defignore' file instead
  -h,--help                               This help message
  -i,--input <arg>                        Source directory. Default is
                                          current directory

docs/zh/manuals/bob.md

@@ -49,7 +49,8 @@ usage: bob [options] [commands]
     --defoldsdk <arg>                   指定 defold sdk (sha1) 使用版本
 -e,--email <arg>                        用户电邮
 -ea,--exclude-archive                   要从打包中排除的资源档案. 以此创建空应用用作编译目标
-    --exclude-build-folder              逗号分割的排除目錄列表
+    --exclude-build-folder              DEPRECATED from Defold 1.5.1! Use
+                                        '.defignore' file instead
 -h,--help                               该命令的帮助文档
 -i,--input <arg>                        指定源目录, 默认是当前目录
     --identity <arg>                    指定签名 (iOS)