Adding a function to remove a field of a doc

[zotop]

Now that we can create fields, set their values, get their values. It would also be nice to be able to delete them if wanted.

Thanks.

[benoitc]

added in latest head :

1> couchbeam:start().
** Found 0 name clashes in code paths 
ok
2> couchbeam_server:start_connection().
<0.61.0>
3> Doc = {[{<<"test">>, <<"essai">>}]}.
{[{<<"test">>,<<"essai">>}]}
4> couchbeam_server:open_db(default, {testdb, "testdb"}).
<0.68.0>
5> Doc1 = couchbeam_db:save_doc(testdb, Doc).
{[{<<"test">>,<<"essai">>},
  {<<"_id">>,<<"f056c6a2094ff332dfde570c7d08b0f9">>},
  {<<"_rev">>,<<"1-6a4595a245c383885767cb266adb0d6d">>}]}
6> Doc2 = couchbeam_doc:delete_value(<<"test">>, Doc1).
{[{<<"_id">>,<<"f056c6a2094ff332dfde570c7d08b0f9">>},
  {<<"_rev">>,<<"1-6a4595a245c383885767cb266adb0d6d">>}]}

[zotop]

Thank you. :)