[fix] issue#11 - print only first 18 core registers.
getRegisters print only core registers

	- new method in cortex_m, to get register name
	- fpu registers are ignored when -g command is sent
gdbserver - only r0 to r16 are printed in getRegister
Merge pull request #13 from 0xc0170/dev_issue#11

[fix] issue#11