#25 Fix the compiling error with the last version of Arduino IDE

[Hawk]

Fix the compiling error with the last version of Arduino IDE.

utility.cpp : In function ' void RemoveSpaces ( String & ) ' :
utility.cpp : 40 : 6 : error : ' String class ' has no member named ' remove'
l.remove (i, 1 ) ;
^
utility.cpp : In function ' boolean getFloat ( uint8_t & , float & , String & ) ' :
utility.cpp : 58 : 12 : error : ' String class ' has no member named ' toFloat '
tmp.toFloat val = ( ) ;