Rename "Micro Python" to "MicroPython" in REPL, help, readme's and misc.

README.md

@@ -9,7 +9,7 @@
 [istats-issue-repo]: http://issuestats.com/github/micropython/micropython
 
 The MicroPython project
-========================
+=======================
 <p align="center">
   <img src="https://raw.githubusercontent.com/micropython/micropython/master/logo/upython-with-micro.jpg" alt="MicroPython Logo"/>
 </p>

esp8266/README.md

@@ -1,5 +1,5 @@
 MicroPython port to ESP8266
-============================
+===========================
 
 This is a highly experimental port of MicroPython for the WiFi modules based
 on Espressif ESP8266 chip.