Fixes the shebang line

- fixes the shebang line by moving it above the copyright notice in
  executables.

- also fixes the execution bit on all the binaries
diff --git a/src/ruby/bin/math_server.rb b/src/ruby/bin/math_server.rb
old mode 100644
new mode 100755
index a0f301c..0e47f71
--- a/src/ruby/bin/math_server.rb
+++ b/src/ruby/bin/math_server.rb
@@ -1,3 +1,5 @@
+#!/usr/bin/env ruby
+
 # Copyright 2014, Google Inc.
 # All rights reserved.
 #
@@ -27,8 +29,6 @@
 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#!/usr/bin/env ruby
-#
 # Sample gRPC Ruby server that implements the Math::Calc service and helps
 # validate GRPC::RpcServer as GRPC implementation using proto2 serialization.
 #