Fix for escaped separators

I was finding myself using this plugin a lot with LaTeX tables that had the ```&``` symbol as content within a cell, so had to escape it like ```\&```. Since the plugin didn't know I was escaping this separator, the tables weren't being aligned as it was supposed.

Here's an unaligned table:
```
a1 \& a2 & b & c \\
a & b & c \\
```

aligning with this fix:
```
a1 \& a2 & b & c \\ 
a        & b & c \\ 
```

aligning without this fix:
```
a1 \ & a2 & b    & c \\
a    & b  & c \\ 
a & b & c \\
```
I am even getting a new line (this only happens when the number of separators is different between lines though, but, even if there is a equal number of separator between lines, the ```\``` and the ```&``` get separated, which isn't intended).

Hope you find it useful too. Cheers.