Basic tests: total 55%

using driver files Erast.java and Text.java (modified from original version)

1. Erast with magic number 20:  10%
   Erast with magic number 500: 15%
   exit properly (all threads exit cleanly): 5%

2. Text: 20%
   exit properly: 5%

Advanced tests: total 35%

using driver files Flip.java and Text2.java, and another filter in file
ChangeCase.java

1. Flip text filters: StringMatcher + Translate: 15%

2. Add a filter into the pipeline: Translate + ChangeCase + StringMatcher: 20%
The compute thread ChangeCase changes an input character to uppercase if
it's in lowercase; otherwise, changes it to uppercase.


Text.java is the modified Text test driver which has a new dictionary.
testinout1.txt is the text input file.
ChangeCase.java is the compute thread filter that changes case from upper
to lower or vice versa.



Instructions for testing:

1. Erast 20 and Erast 500: Use the Erast test driver to do both tests.

2. Text: Use the command: java Text Tristan < testinput1.txt

The result should be:
-------------------------
ta:Tristan
-------------------------

3. Flip: Use the command: java Flip 64328 < testinput1.txt

The result should be:
-------------------------
ta:Tristan
-------------------------

4. 3 Filters: Use the command: java Text2 TA < testinput1.txt

The result should be:
-------------------------
TA:tRISTAN
ATA:SATANC
-------------------------