slurp dictionaries

`load_dictionary('enable1.txt')` is no longer a bottleneck.

before: 
```
$ time minil test
...
real	0m8.305s
user	0m7.607s
sys	0m0.444s
```

after:
```
$ time minil test
...
real	0m5.068s
user	0m4.629s
sys	0m0.441s
```