added some ncbi functionality

However there is some problem with eol?

I don't think that this error was introduced by me (just changed the function name...).
Any Ideas?

```
sci2comm('Acer pseudoplatanus', db='eol')
Using default key: Please get your own API key at http://eol.org/users/register
Using default key: Please get your own API key at http://eol.org/users/register
$`Acer pseudoplatanus`
         vernacularName language eol_preferred     X..3L..  X..4L..     X..6L..       X..7L..
1            Berg-Ahorn       de          TRUE        <NA>     <NA>        <NA>          <NA>
2        sycamore maple       en          TRUE        <NA>     <NA>        <NA>          <NA>
3                  <NA>     <NA>            NA Great Maple     <NA>        <NA>          <NA>
4                  <NA>     <NA>            NA          en     <NA>        <NA>          <NA>
5                  <NA>     <NA>            NA        <NA> sycamore        <NA>          <NA>
6                  <NA>     <NA>            NA        <NA>       en        <NA>          <NA>
7                  Arce       es          TRUE        <NA>     <NA>        <NA>          <NA>
8                  <NA>     <NA>            NA        <NA>     <NA> Arce blanco          <NA>
9                  <NA>     <NA>            NA        <NA>     <NA>          es          <NA>
10                 <NA>     <NA>            NA        <NA>     <NA>        <NA> Falso plátano
11                 <NA>     <NA>            NA        <NA>     <NA>        <NA>            es
12                 <NA>     <NA>            NA        <NA>     <NA>        <NA>          <NA>
13                 <NA>     <NA>            NA        <NA>     <NA>        <NA>          <NA>
14        Vuorivaahtera       fi          TRUE        <NA>     <NA>        <NA>          <NA>
15 Érable des montagnes       fr          TRUE        <NA>     <NA>        <NA>          <NA>
16       Acero di monte       it          TRUE        <NA>     <NA>        <NA>          <NA>
17      paltin de munte       ro          TRUE        <NA>     <NA>        <NA>          <NA>
    X..8L..
1      <NA>
2      <NA>
3      <NA>
4      <NA>
5      <NA>
6      <NA>
7      <NA>
8      <NA>
9      <NA>
10     <NA>
11     <NA>
12 sicomoro
13       es
14     <NA>
15     <NA>
16     <NA>
17     <NA>
```