Minor changes to make "gcc -Wextra" happy

Clarify README with respect to legacy version

fix spelling

Fixed by explicitly using /bin/bash. Removing bash-isms would also
work. But /bin/sh is bash on most developers' systems, so using that
shell explicitly seems like it's less likely to break in the future.

characters are between 0-9, and setting an error case otherwise.

Signed-off-by: Lloyd Hilaiel <lloyd@hilaiel.com>

calls like YAJL_IS_INTEGER fail, even though parsing succeeded.
Consisted of removing checks that would have been necessary, if the
custom integer parsing wasn't used.

Signed-off-by: Lloyd Hilaiel <lloyd@hilaiel.com>

Fixed memory leak

yajl_gen_escape_solidus is unsettable

yajl_gen_double does not always emit decimal point

errno not being reset

update yajl_gen_double to enforce that serialized double values always contain a decimal point, even if no digits follow the point.  this prevents some readers from parsing such values as an integer.

validate the length of the correct object in yajl_tree_get