clientRead: keep reading if client not connected but data is available

[pennam]

Should fix #56

@Jeroen88 could you give it a spin?

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Memory usage change @ 832f30a45403fac23aba5f20ae0dfa50bb51cf53

Board	flash	%	RAM for global variables	%
arduino:megaavr:uno2018	0 - 0	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkr1000	:small_red_triangle: 0 - +8	0.0 - 0.0	0 - 0	0.0 - 0.0
arduino:samd:mkrgsm1400	:small_red_triangle: 0 - +8	0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/SHA1 flash	%	examples/SHA1 RAM for global variables	%	examples/SHA256 flash	%	examples/SHA256 RAM for global variables	%	examples/WiFiSSLClient flash	%	examples/WiFiSSLClient RAM for global variables	%	examples/MKRGSMSSLClient flash	%	examples/MKRGSMSSLClient RAM for global variables	%
arduino:megaavr:uno2018	0	0.0	0	0.0	0	0.0	0	0.0
arduino:samd:mkr1000	0	0.0	0	0.0	0	0.0	0	0.0	8	0.0	0	0.0
arduino:samd:mkrgsm1400	0	0.0	0	0.0	0	0.0	0	0.0					8	0.0	0	0.0

Click for full report CSV

Board,examples/SHA1<br>flash,%,examples/SHA1<br>RAM for global variables,%,examples/SHA256<br>flash,%,examples/SHA256<br>RAM for global variables,%,examples/WiFiSSLClient<br>flash,%,examples/WiFiSSLClient<br>RAM for global variables,%,examples/MKRGSMSSLClient<br>flash,%,examples/MKRGSMSSLClient<br>RAM for global variables,%
arduino:megaavr:uno2018,0,0.0,0,0.0,0,0.0,0,0.0
arduino:samd:mkr1000,0,0.0,0,0.0,0,0.0,0,0.0,8,0.0,0,0.0
arduino:samd:mkrgsm1400,0,0.0,0,0.0,0,0.0,0,0.0,,,,,8,0.0,0,0.0

[Jeroen88]

I actually do not use this library, so I can not check it, but the code looks good to me.

[pennam]

Closing this because c->connected() should return true if client socket is truly connected or there is data available in the read buffer.