…ank and extra json,

add parse_true test and parse_false unit test,
add parse_true function and parse_false function

…_parse_literal

2.add test of subnormal of double number
3.verify more number cases to pase
4.handle over range numbers

	add two macro ISDIGIT and ISDIGIT1TO9
	changed strtod para to NULL

2.implement lept_get_boolean, lept_set_boolean, lept_get_number, lept_set_number
3.parse string,complete lept_parse_string
4.solved invalid string

2.handled surrogate pair in case 'u'

1. add test_parse_array to test.c
2. handle white space in lept_parse_array
3. handle memory leak by adding case to lept_free, recursively free element in array
4. deal with memory when parse is not successful, use break instead of return error. Pop and free values on the stack