3DES: Fixed ContinuousBuffer() in CTR/CFB/OFB

FIXED: multiple calls to enable/enableContinuousBuffer() work's now in CTR/CFB/OFB
FIXED: "Illegal string offset" and strlen(array()) Warning/Notice
Performance improvement in CFB Mode with enableContinuousBuffer() using MODE_MCRYPT
[coverage-text] Generate text code coverage report for output on travis console.
Extract the exit_status if given to us from SSH.
Merge pull request #56 from bantu/coverage-text

[coverage-text] Generate text code coverage report for output on travis ...
AES, DES, RC4, Rijndael, TripleDES: multiple changes

- apply petrich's TripleDES / CFB decrypt to AES and DES
- make DES use the updated _generate_xor
- correct a comment typo
Merge remote-tracking branch 'upstream/master'
Merge pull request #59 from tamagokun/set_exit_status

Get the exit status in ssh
AES: Fixed CFB decrypt() using MODE_MCRYPT and ContinuousBuffer

AES: Fixed small bug from commit https://github.com/phpseclib/phpseclib/commit/d94f1b252db66f52c42fcc8d4c6f1a3f10f5ff4e (AES.php in line 425-426)
in CFB decrypt() using CRYPT_AES_MODE_MCRYPT and enableContinuousBuffer()
DES: Fixed CFB decrypt() using MODE_MCRYPT and ContinuousBuffer

DES: Fixed small bug from commit https://github.com/phpseclib/phpseclib/commit/d94f1b252db66f52c42fcc8d4c6f1a3f10f5ff4e (DES.php in line 739-740)
in CFB decrypt() using CRYPT_DES_MODE_MCRYPT and enableContinuousBuffer()
Merge pull request #62 from petrich/patch-4

DES: Fixed CFB decrypt() using MODE_MCRYPT and ContinuousBuffer
Merge pull request #61 from petrich/patch-3

AES: Fixed CFB decrypt() using MODE_MCRYPT and ContinuousBuffer
Rijndael: little code optimizing

little code optimizing
RC4: fixed ContinuousBuffer() using MODE_MCRYPT

Fixed multiple calls to ContinuousBuffer() using MODE_MCRYPT
Merge pull request #64 from petrich/patch-5

RC4: fixed ContinuousBuffer() using MODE_MCRYPT
Merge pull request #63 from petrich/patch-3

Rijndael: little code optimizing
add size checking to binary packets in Net/SSH2.php (thanks ?????? ????????!)
Rijndael: Performance update

Performance update for Rijndael
AES: Performance update

Performance update for AES
Related to: https://github.com/phpseclib/phpseclib/pull/65
RC4: keys were never being set in continuous mode
Merge pull request #66 from petrich/patch-5

AES: Performance update