Add userphrase without bopomofo

[ShengYenPeng]

when we typing sentense with libchewing, the sentense will be splitted
into separate phrase and stored into chewing-editor. we can use this
characteristic to reassemble the bopomofo of the phrase we want to add.

now we can add new phrase with chewing-editor without bopomofo.

[coveralls]

Coverage remained the same at 94.382% when pulling e80f79a on ShengYenPeng:master into 07871c9 on chewing:master.

[davy-tw]

Does this way always work?

For example, if there already have phrase 得(ㄉㄟˇ) and 得(ㄉㄜˊ) in database.
And then I add 得到(ㄉㄜˊㄉㄠˋ) without giving bopomofo, so what bopomofo will I get in the result?
ㄉㄜˊㄉㄠˋ or ㄉㄟˇㄉㄠˋ？

[ShengYenPeng]

because the related word will be refresh to the bottom of the database( chewing-editor list),
the 得（ㄉㄜˊ） would be found earlier than 得（ㄉㄟˇ）, so you will get ㄉㄜˊ ㄉㄠˋ