Fix consecutive stars

[aaronchantrill]

I had a problem with a with two consecutive stars in it, one for a person's first name and the second for the last name. The was returning the last name correctly, but the <thatstar/> or <thatstar index="1"/> kept coming back empty. It turned out to be that the parser was looking for a match between the next word in the pattern and the next word in the words list. When the next word was a star, it would not match.

Here is an example:

<aiml>
    <category>
        <pattern>ASK ME A QUESTION</pattern>
        <template>
            <random>
                <li>Do you listen to <random>
                    <li>Elvis Presley</li>
                    <li>Eddie Van Halen</li>
                    <li>Michael Jackson</li>
                </random> music?</li>
            </random>
        </template>
    </category>
    <category>
        <pattern>YES</pattern>
        <that>DO YOU LISTEN TO * * MUSIC</that>
        <template>I also listen to Mr. <thatstar index="2"/></template>
    </category>
    <category>
        <pattern>NO</pattern>
        <that>DO YOU LISTEN TO * * MUSIC</that>
        <template>Well <thatstar/> listens to you!</template>
    </category>
</aiml>

This fixes the issue by checking if the next word in a match is another star and, if so, then stopping after the first word.

I also took the liberty of adding Jupyter Notebook files to .gitignore so I wouldn't see mine when getting git status.

[Hierosme]

Any chance to merge it PR ?