Service now can use default sendRequest function

new constructor added to Service, that sets default sendRequest function
cURLpp is now extracted to src/cURLpp/
sendRequest renamed to defaultSendRequest
scons files changed to compile sendRequest  and cURLpp into main library
changes in test files reflecting changed filename and function name
Add scons options, that specify curl location

--curl-libpath and --curl-includepath options added
Modify readme

added information about --openssl-libpath and --openssl-includepath parameters
readme restructured, as it became too redundant
Move ParameterList header

move ParameterList.h from src/ to include/
Merge pull request #30 from swat32exe/move-parameterlist-header

Move ParameterList header
Fix service constructor comment
Merge pull request #29 from swat32exe/add-default-network

Add default sendRequest
Make possible to build library without curl and rsa signature -related files

add --with-curl flag
add preprocessor macroses, that
	allow to build without Service constructor, that uses default sendRequest
	allow to build completely without RSA_SHA1 signature
Update README.md, to describe --with-curl flag usage
Fix exception message in Signature class

fix exception message for unsupported signing method in Signature class
Fix README.md

README.md restructured
Use #ifdef in Service interface instead of throwing exception
Merge pull request #42 from swat32exe/make-curl-optional

Make curl and rsa signature optional